Beckwith Electronics


824 Horan Drive, Fenton, Mo 63026
(636) 343-6463
(636) 343-7026 fax

EAO Switch

Lamps & Legends

Light Sources

The following information presents a description of the various light sources available for EAO products and a guide to their selection.

All EAO light sources in a socket can be relamped from the front panel for quick and easy replacement.

All EAO light sources are stationary within the switch assembly. By avoiding lamp travel, operating life is materially increased.

All EAO light sources are designed for even distribution, with no halo or hot spots.

Incandescent lamps, neon lamps, and LEDs (light emitting diodes) are available for most EAO switch products (see chart "Light Sources Available" for selection.) These three types of light sources have distinctly different characteristics. Each must be matched with appropriate lenses and other accessories for best results.

EAO lighted devices offer the designer a wide range of appearance options. Colors can be vivid or subdued. Lenses and legends can change color when illuminated. Legends can be hidden, appearing only when lighted, or be split, with one part always visible, another part appearing only when lighted. Components and application techniques must be selected for the effect desired.

The following information is intended to help the designer choose the combination of light source, lens, lens holder or diffuser, film insert, color filter, etc. to best meet the needs of a particular application.

Incandescent Lamps

The miniature and subminiature incandescent lamp is the most widely used light source for illumination panel devices because of its great versatility. Its omnidirectional and broad-spectrum characteristics make its emissions readily diffusible for even illumination of relatively large areas. The broad spectrum permits filtering for attractive color effects. High intensity provides good brightness even after attenuation by diffusing and/or filtering materials. Good broad area brightness permits free use of legends (by engraving, film inserts, or both) with assured contrast for legibility. Finally, incandescent lamps are available for direct connection to most common system voltages and are inherently self-regulating when so used.

The less desirable characteristics of incandescent lamps are that they operate at relatively high current levels and generate considerable heat. Lamp filaments, unlike solid state semiconductor devices, must operate in a self-destructive mode to produce light. Service life, although often long, is limited.

The average life ratings published by lamp manufacturers (and included in the tables that follow) are based on tests performed under laboratory conditions: stable ambient temperature, no shock or vibration, filaments operated on AC voltage-regulated to ±1%. Average life is the elapsed time after which 50% of the lamps under test have failed. Failure includes a current increase to 10% above the initial current value and/or a brightness decrease to 20% less than initial brightness.

Average lamp life may be shortened by as much as 50% when lamps are operated on DC, which accelerates grain growth of the tungsten filament, leading to earlier development of hot spots. High ambient temperature (above 200°F) shortens lamp life by increasing the rate of tungsten migration away from the filament wire. Lamps become increasingly vulnerable to failure from shock and vibration as they age and filaments are embrittled by grain growth. Failure most often occurs while no current is flowing, when the filament is most brittle.

When shock and vibration will be present it is best to use a low-voltage lamp. Higher-voltage filaments are generally longer and smaller in diameter, with a great number of resonant points. Derating lamps (operating them at less than rated voltage) improves life by lowering filament temperature. Maintaining current through the filament keeps the filament more resilient than if current is switched off entirely, and minimizes cold tungsten filament shock. (Less than 1% of rated voltage is required.) Operation of lamps in constant current or series circuit applications may reduce lamp life by subjecting filaments to excessive voltage.

Operating the pushbutton of an EAO device does not subject the lamp to shock or vibration forces. The lamp is fixed, its socket being integral with the body of the device. Moving parts of the pushbutton are all isolated from the lamp.

Lamps carried in stock by EAO meet most common application needs. Quantity permitting, many other lamps can be obtained to meet special requirements. Consult Beckwith Electronics.

When a lamp is to operate at other than rated voltage, the following formulas may be used to predict the effects on luminous intensity, life, and current. The results are reliable for applied voltages close to the rated voltage. The further the deviation from rated voltage, the greater the percentage of error in the approximation.

Neon Lamps

Neon lamps are low-current, long-life light sources limited by the high ionization voltage of neon (>80 V) for use in line voltage circuits. Because the ionized gas holds a constant potential between lamp electrodes, a series resistor is required for current limiting. Larger lamps often include an integral resistor sized for a specific voltage.

Neon lamps glow with a low-intensity amber light, or green if the lamp is phosphor-coated. Bright light and vivid colors are not obtainable with neon lamps, but their typical low current drain, better than 25,000 hour service life, and good resistance to shock and vibration make them useful alternatives in many line voltage applications. For best visibility, they should be used with clear lenses and diffusers.

Light Emitting Diodes

Solid-state LEDs operate at relatively low current levels and have virtually unlimited service life. Characteristics do not change significantly with age, and they are not easily damaged by shock or vibration. The light emitted, however, is of relatively low intensity. To offset this, instead of using the single chip concept in certain LED base configurations, we use a four, six, or eight chip configuration with a wide viewing angle and increased light intensity. Although not as intense as an incandescent lamp, multi-chip performance is very good, and should be adequate for many applications.

Another feature of multi-chip based LEDs is the inclusion of a built-in resistor to accommodate higher voltages without an external resistor. EAO stocks the common voltages of 6, 12, 24, and 48 volts, and are offered in red, green, and yellow.

The single chip LED is only used in our T-1 configuration. Due to small size, multi-chip design currently is not practical in T-1 size. However, since the T-1 normally is used in a confined space with a small lens, the high efficiency single-chip LEDs we use produce excellent results.

Current limiting and reverse polarity protection for LEDs can be provided by external LED control circuits.

Selection of a proper lens can increase brightness. For example, the use of a transparent lens cap and transparent diffuser increases light output, and is usually needed for the larger lenses.

Lamp Tables

The following tables help users select illumination for each EAO switch series. They present data characterizing incandescent lamps, neons, and LEDs.

The tables indicate each switch series covered and include the following information:

Illumination type and style of bulb

Outline drawing of bulb

General data including color and number of LED chips

Electrical ratings: volts and milliamps

Luminous intensity in mean spherical candle power (mscp), millicandela (mcd), millilumens (mim)

Average expected life in hours

EAO part number

Series 01, 14 Illumination
Illumination Type	General Data	Electrical Ratings		Luminous Intensity	Average Life (hours)	Former P/N	Part Number
		Volts	Milliamps
Incandescent* T-5.5, Slide Base	Clear	6	200	0.48 mscp	6,000	01-903.0	10-1106.1369
	Clear	12	100	0.32 mscp	5,000	01-903.1	10-1109.1329
	Clear	24	50	0.27 mscp	6,000	01-903.2	10-1112.1279
	Clear	30	40	0.29 mscp	6,000	01-903.3	10-1114.1249
	Clear	36	35	0.25 mscp	5,000	01-903.4	10-1116.1229
	Clear	48	25	0.21 mscp	5,000	01-903.5	10-1119.1199
	Clear	60	20	0.17 mscp	6,000	01-903.6	10-1120.1179
Neon T-5.5, with integral resistor	Amber	115	1.7	100 mim	>25,000	01-960.8	10-7123.2022
	Amber	230	1.8	100 mim	>25,000	01-960.9	10-7125.2032
	Green	115	1.6	100 mim	>25,000	01-961.8	10-7123.2025
	Green	230	1.7	100 mim	>25,000	01-961.9	10-7125.2025
Multi-chip LED T-5.5, with integral resistor	6-chip	6 DC	45	45/50/115 mcd**	>50,000	01-968.0�	10-5016.325�
	6-chip	12 DC	30	45/50/115 mcd**	>50,000	01-968.1�	10-5109.320�
	6-chip	24 DC	15	45/50/115 mcd**	>50,000	01-968.2�	10-5112.314�
	6-chip	28 DC	15	36/63/90 mcd**	>50,000		10-5113.314�
	6-chip	48 DC	14	42/46/107 mcd**	>50,000	01-968.4�	10-5119.313�
Series 02, 03 Illumination
Incandescent* T-6.8, Slide Base	Clear	6	200	0.48 mscp	5,000	02-903.0	10-1206.1369
	Clear	12	100	0.44 mscp	5,000	02-903.1	10-1209.1329
	Clear	24	50	0.28 mscp	6,000	02-903.2	10-1212.1279
	Clear	30	40	0.36 mscp	6,000	02-903.3	10-1214.1249
	Clear	36	35	0.25 mscp	5,000	02-903.4	10-1216.1229
	Clear	48	25	0.21 mscp	5,000	02-903.5	10-1219.1199
	Clear	60	20	0.18 mscp	6,000	02-903.6	10-1220.1179
Neon T-6.8, with integral resistor	Amber	115	1.7	60 mim	>25,000	02-960.8	10-7223.2022
	Amber	230	1.8	60 mim	>25,000	02-960.9	10-7225.2032
	Green	115	1.6	60 mim	>25,000	02-961.8	10-7223.2025
	Green	230	1.7	60 mim	>25,000	02-961.9	10-7225.2025
Multi-chip LED T-6.8, with integral resistor	6-chip	6 DC	45	45/50/115 mcd**	>50,000	02-968.0�	10-5216.325�
	6-chip	12 DC	30	45/50/115 mcd**	>50,000	02-968.1�	10-5209.320�
	6-chip	24 DC	15	45/50/115 mcd**	>50,000	02-968.2�	10-5212.314�
	6-chip	28 DC	15	36/63/90 mcd**	>50,000		10-5213.314�
	6-chip	48 DC	14	42/46/107 mcd**	>50,000	02-968.4�	10-5219.312�
Series 04 Illumination
Incandescent T-3 1/4, bayonet base For higher voltages use lamp transformer or resistor/capacitor block	Clear	6	200	0.30 mscp	15,000	700-000.0	10-1406.1369
	Clear	12	100	0.25 mscp	10,000	700-000.1	10-1409.1329
	Clear	24	50	0.32 mscp	5,000	700-000.2	10-1412.1279
	Clear	36	56	0.50 mscp	5,000	700-000.3	10-1416.1289
	Clear	48	42	0.50 mscp	5,000	700-000.4	10-1419.1249
	Clear	60	33	0.40 mscp	3,000	700-000.5	10-1426.1219
	Clear	110	22	0.30 mscp	4,000	700-000.6	10-1422.1179
	Clear	130	20	0.10 mscp	7,000	700-000.7	10-1424.1179
Neon T-3 1/4, with integral resistor	Amber	115	0.7	100 mim	>25,000	700-001.0	10-7423.2012
	Amber	230	1.5	100 mim	>25,000	700-001.1	10-7425.2022
	Amber	400	0.8	100 mim	>25,000	700-001.2	10-7426.2012
Multi-chip LED T-3 1/4, with integral resistor	8-chip	6 DC	80	50/30/30 mcd**	>50,000	700-002.0�	10-6406.331�
	8-chip	12 DC	40	50/30/30 mcd**	>50,000	700-002.1�	10-6409.324�
	8-chip	24 DC	19	50/30/30 mcd**	>50,000	700-002.2�	10-6412.316�
	8-chip	48 DC	16	50/30/30 mcd**	>50,000	704-002.4�	10-6419.315�
Series 11, 19, 99 Illumination
Incandescent* T-1, Bi-Pin Series 11, 99	Clear	6	115	0.15 mscp	3,000	11-903.0	10-1606.1339
	Clear	12	60	0.15 mscp	10,000	11-903.1	10-1609.1289
	Clear	18	26	0.15 mscp	10,000	11-903.2	10-1611.1119
	Clear	24	24	0.15 mscp	25,000	11-903.3	10-1612.1189
	Clear	28	24	0.15 mscp	25,000	11-903.4	10-1613.1189
Incandescent* T-1, Bi-Pin Series 19	Clear	6	70	0.90 mscp	40,000	19-903.00	Discontinued for reference only 10-1606.1309
	Clear	12	25	0.25 mscp	2,000	19-903.10	10-1609.1199
	Clear	24	20	0.20 mscp	5,000	19-903.30	10-1612.1179
LED T-1, Bi-Pin	Red	1.7 DC	20	30 mcd	50,000	99-943.02	10-2602.3172C
	Yellow	2.1 DC	20	30 mcd	50,000	99-943.04	10-2602.3174C
	Green	2.1 DC	20	20 mcd	50,000	99-943.05	10-2602.3175C
Multi-chip LED, T-1, Bi-Pin	Red, 4-chip	28 DC	12	14 mcd	50,000	11-968.32	10-4613.3102B
	Orange, 4-chip	28 DC	12	26 mcd	50,000	11-968.33	10-4613.3103B
	Yellow, 4-chip	28 DC	12	22 mcd	50,000	11-968.34	10-4613.3104B
	Green, 4-chip	28 DC	12	30 mcd	50,000	11-968.35	10-4613.3105B
Series 22, 30, 31, 51, 52, 61, 71 Illumination
Incandescent* T-1 3/4, Midget Grove Base	Clear	6.3	200	0.40 mscp	20,000	31-963.0	10-1307.1369
	Clear	14	80	0.30 mscp	15,000	31-963.1	10-1310.1319
	Clear	28	40	0.30 mscp	10,000	31-963.2	10-1313.1249
	Clear	36	30	0.28 mscp	5,000	31-963.5	10-1316.1209
	Clear	48	25	0.20 mscp	5,000	31-963.3	10-1319.1199
	Clear	60	20	0.15 mscp	5,000	31-963.4	10-1320.1179
Multi-chip LED T-1 3/4 with integral resistor	6-chip	6 DC	45	45/50/115 mcd**	>50,000	31-968.0�	10-5306.325�
	6-chip	12 DC	30	45/50/115 mcd**	>50,000	31-968.1�	10-5309.320�
	6-chip	24 DC	14	45/50/115 mcd**	>50,000	31-968.2�	10-5312.313�
	6-chip	48 DC	12	36/40/92 mcd**	>50,000	31-968.4�	10-5319.312�
Series 41 Illumination
Incandescent* T-1 3/4, Midget Grove Base	Clear	6	125	0.35 mscp	10,000	41-963.0	10-1306.1349
	Clear	12	75	0.20 mscp	10,000	41-963.1	10-1309.1309
	Clear	18	40	0.20 mscp	5,000	41-963.2	10-1311.1249
	Clear	24	35	0.20 mscp	5,000	41-963.3	10-1312.1229
	Clear	28	30	0.30 mscp	5,000	41-963.4	10-1313.1209
	Clear	48	20	0.20 mscp	5,000	41-963.5	10-1319.1179
Multi-chip LED T-1 3/4 with integral resistor	6-chip	6 DC	45	45/50/115 mcd**	>50,000	31-968.0�	10-5306.325�
	6-chip	12 DC	30	45/50/115 mcd**	>50,000	31-968.1�	10-5309.320�
	6-chip	24 DC	15	45/50/115 mcd**	>50,000	31-968.2�	10-5312.313�
	6-chip	48 DC	12	36/40/92 mcd**	>50,000	31-968.4�	10-5319.312�
Series 70, 84, 92 Illumination
LED, T-1 Bi-Pin	Red	2.0 DC	20	8	50,000	92-948.2	10-2602.3172D
	Orange	2.2 DC	20	12	50,000	92-948.3	10-2602.3173D
	Yellow	2.1 DC	20	20	50,000	92-948.4	10-2602.3174D
	Green	2.1 DC	20	12	50,000	92-948.5	10-2602.3175D
LED, T-1, Multi-Chip	Red	12.0 DC	20	45	50,000	92-945.2	10-5609.3172D
	Orange	12.6 DC	20	50	50,000	92-945.3	10-5609.3173D
	Yellow	12.9 DC	20	135	50,000	92-945.4	10-5609.3174D
	Green	12.9 DC	20	30	50,000	92-945.5	10-5609.3175D
LED, T-1, Multi-Chip	Red	6	40	45	>50,000	92-944.2	10-5606.3242D
	Orange	6.3	40	50	>50,000	92-944.3	10-5606.3423D
	Yellow Green	6.5	40	135	>50,000	92-944.4	10-5606.3244D
LED, T-1, Multi-Chip, Bi-Color	Red/Green	4.2-8.5 DC use external resistors	20	20/30	50,000	92-945.2/5	10-5604.317AD
Series 96 Illumination
LED, T-1, Bi-Pin
Standard - leads not cut	Red	2.1 DC	20	3.5	50,000	98-843.021	EUS98-843.021
	Yellow	2.1 DC	20	3.5	50,000	98-843.041	EUS98-843.041
	Green	2.1 DC	20	2.5	50,000	98-843.051	EUS98-843.051
Leads cut to proper length with special form to lock in position	Red	2.1 DC	20	3.5	50,000	98-843.022	10-2602.3172E
	Yellow	2.1 DC	20	3.5	50,000	98-843.042	10-2602.3174E
	Green	2.1 DC	20	2.5	50,000	98-843.052	10-2602.3175E
Leads formed for A & D holes	Red	2.1 DC	20	3.5	50,000	98-843.023	10-2602.3172H
	Yellow	2.1 DC	20	3.5	50,000	98-843.043	10-2602.3174H
	Green	2.1 DC	20	2.5	50,000	98-843.053	10-2602.3175H
Leads cut for Euro-style key caps	Red	2.1 DC	20	3.5	50,000	96-848.21	10-2602.3172K
	Yellow	2.1 DC	20	3.5	50,000	96-848.41	10-2602.3174K
	Green	2.1 DC	20	2.5	50,000	96-848.51	10-2602.3175K
Series 97 Illumination
LED, T-1, Bi-Pin High intensity , wide angle	Red	2.0 DC	20	8	50,000	97-946.02	10-2602.3172G
	Qrange	2.0 DC	20	12	50,000	97-946.03	10-2602.3173G
	Yellow	2.1 DC	20	20	50,000	97-946.04	10-2602.3174G
	Green	2.1 DC	20	12	50,000	97-946.05	10-2602.3175G

Series 18 Illumination
Illumination Type	General Data	Electrical Ratings		Luminous Intensity (mcd)	Average Life (hours)	Integral Lens and LED Part Number
		Volts	Milliamps			Rectangular	Square	Round
LED High intensity LED is part of the Weries 18 illuminated lens	Red	2.0 DC	20	8	>50,000	18-941.2	18-951.2	18-931.2
	Yellow	2.1 DC	20	20	>50,000	18-941.4	18-951.4	18-931.4
	Green	2.1 DC	20	12	>50,000	18-941.5	18-951.5	18-931.5

Legend & Illumination Techniques
General. The great variety of legend and illumination effects obtainable with EAO devices includes not only the choice of light source, but also lens and legend style selection. While details vary from series to series, the lens system generally consists of two parts: 1. the lens cap and 2. a diffuser or lens holder that usually are combined under one part number.

Illumination effects depend on the following component choices:

1. Lighting Device

Incandescent lamp
LED
Neon lamp

2. Lens Cap

Color
Transparent or translucent

Diffuser

Color
Translucent or clear

Legends are usually produced by engraving on the lens or diffuser surface, or films can be inserted between the lens cap and the diffuser.

Intensity changes when illuminated.
This most common effect is obtained by using any colored lens and is called transmitted color. More vivid color change effects can be created by using a Solar Black lens. When unlit, this lens appears to be opaque black and will conceal a colored film insert or film holder behind it. When the lamp lights, however, the lens becomes illuminated and visible.

Visible legend: background lights.
This effect can be obtained with any lens by having the legend engraved into the lens and filled with contrasting ink. Where heavy pushbutton use might wear off an engraving, the legend can instead be engraved and filled on the diffuser. As an alternative to engraving, a film positive insert can be used between a transparent lens and a translucent backing element.

Visible legend: background color changes when lighted.
For this effect, use a clear lens, a film positive insert, a translucent white backing element, and a color filter boot on the lamp. This is called projected color.

Dead front: legend appears only when illuminated. With a translucent lens, this can be done by engraving and filling the legend on the backing element, or by using a film insert (positive for lighted background, negative for lighted legend). It can also be obtained using a Solar Black lens with a film insert and white or colored backing element.

Other effects.
Combined visible/hidden legend effects can be achieved by engraving the visible portion on a translucent or Solar Black lens and the hidden portion on the backing element. For phototypes and low-volume projects, transfer lettering and transparent color films available at art supply shops may be useful additions to the lenses, accessories, and services offered by EAO.

Film Legends

Film Legends
A film, either black and white or color, may be inserted between the lens cap and diffuser. To prepare the lens for film, simply press the diffuser legs together and remove the lens cap. Film then may be placed on the diffuser and the cap snapped back into its original position. When using film, it is recommended that a transparent lens cap be used. In applications where the legend is to appear only when illuminated, use the dead front technique.

Typical film application

Color Filter Boots
Color filter boots are made from silicon rubber material and fit over the specific lamp. The effect of using a colored filter boot is to project the color of the boot onto the lens area. Used with a translucent white lens or a clear lens, this technique presents a change from a white indication when unlighted to a pleasing pastel colored glow when illuminated. A second advantage of using a color filter boot is an increase in lamp life by 5-6 percent because the boot acts as a heat sink.

Series 92 Legends
Series 92 pushbuttons and indicators can be obtained with a legend or symbol. A drawing or artwork is required. IP 40 actuators are engraved on the lens surface. IP 67 actuators are engraved on the legend plate.

The standard stroke thickness is 0.5 mm (0.020").

Legends are filled with a special hard enamel paint. Red, blue, green, black, and gray colored lenses are filled with white paint. All other color lenses are filled with black paint.

Film legends may be used. The film should be as specified in the above chart. Consult Beckwith Electronics for details. When removing membrane caps to insert film, tool 92-998 must be used to assure proper installation.

Laser and pad printing are also available when large quantities are required. Cost savings are substantial, but these techniques require high costs for initial set-up.

Any special symbols will require a one-time charge for producing plates or appropriate computer programming.

Height of letters (mm) No. of lines Letters per line (capitals) 3 2 5-6 4 2 4 5 1 3 6 1 2-3 8 1 2

Legend & Engraving information

Engraved legends

Legends are engraved on the front surface of the lens cap and ink filled. Red, blue, green, black, and gray colored lens caps are refilled with white ink. All other colons are filled with black Ink.

Engraving type is condensed gothic, with standard 0.125" by 0.020" stroke. Legend Arrangements

How to Order Engraved Legends
Clearly identify legends requirement, as a separate item, using the following instructions:

Commas* denote a separate line of engraving.
A slash* denotes a saparate lens section or division.
(* When comma/slash are part of engraving, indicate by seperate note.)

Legend Arrangements
Series	Rectangular			Vertical			Round			Square			Split Rec. (R) Vert.(V) Sections
	Lens Part No.	Max. No. of Lines	Max. No. of Letters	Lens Part No.	Max. No. of Lines	Max. No. of Letters	Lens Part No.	Max. No. of Lines	Max. No. of Letters	Lens Part No.	Max. No. of Lines	Max. No. of Letters	Lens Part No.	Max. No. of Lines	Max. No. of Letters
01	01-901	2	7	01-901	4	4	01-931	2	5	01-951	2	4
02/22	02-901	3	10	02-901 02-902	4	7
03	03-901 03-941	4	16	03-901 03-941	8	6							03-902 03-943	3	6
04							704-608.9	3	9	704-708.9	4	9
							704-609.9	3	7	704-709.9	4	8
14							See Series 04
18, 19	Pushbuttons and indicators can be engraved. Please contact Beckwith Electronics
30	See series 31
31	31-901	3	8	31-901	4	5	31-931	2	5	31-951	3	5
41	See Series 31												41-903	4	3(R)
													41-907	2	5(V)
51	51-901	3	8	51-901	4	5	51-931	2	5	51-951	3	5
61 Std. Overhang. lens	61-923.1	3	8	61-923.1	4	5	61-921.1	2	5	61-922.1	3	5 (Large Sq. 61-925.1, 3 lines, 7 letters)
	61-928.1	3	9	61-928.1	4	6				61-927.1	3	6
92										See Note 1	2	6
99	99-963	3	16							99-908	3	6
	99-968	3	25

Series 96
Height of letters (h)
	No. of lines	Letters per line	No. of lines	Letters per line	No. of lines	Letters per line
2.5 (0.098)	2	5	2	6	2	7-8
3 (0.118)	2	4	2	5	2	6-7
4 (0.157)	1	3-4	1	4	1	4-5
5 (0.196)	1	2-3	1	3	1	3-4
6 (0.236)	1	2	1	2-3	1	2-3
8 (0.314)	1	1	1	1-2	1	2

Legend and ISO-Symbols for Series 04

Legends and ISO-Symbols are hot stamped on Series 04 and Series 14 diffusers or Series 04 square film. The following part numbers will indicate the component for requesting legends or ISO-Symbols.

Component for Legend or ISO-Symbol	Part Number
Indicator -- round diffuser	704-608.9
Indicator -- round knurled diffuser	704-608.7
Pushbutton -- round diffuser	704-609.9
Pushbutton -- round knurled diffuser	704-609.7
Pushbutton -- round extended diffuser	704-610.9
Pushbutton -- round knurled extended diffuser	704-610.7
Indicator -- square diffuser	704-708.9
Indicator -- square film	704-706.7
Pushbutton -- square diffuser	704-709.9
Pushbutton -- square film	704-707.7

When ordering a legend or ISO-Symbol to be part of the above part numbers, please order as follows:

Example 1:	704-608.9 Legend 1
Example 2:	704-706.7 ISO-8
Example 3:	704-707.7 Legend 15
Example 4:	704-609.9 ISO-27

We carry a large stock of the above components but to assure proper delivery, please allow 6-8 weeks for selected legends or ISO-Symbols to be hot stamped.