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		                        | National Stock Number:
 6650-01-170-4392
 
 Federal Supply Class:
 6650
 
 National Item Identification Number:
 011704392
 
 Description:
 LENS,OPTICAL INSTRUMENT
 
 Detail:
 An unmounted, transparent, color free lens which may be treated with a low reflection coating to increase light transmission. Includes single and compound elements. For items having two plane parallel surfaces, see WINDOW, OPTICAL INSTRUMENT. Excludes RETICLE, OPTICAL INSTRUMENT.
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 Manufacturer Information:
 
 | 13074881 | 04939 | LOCKHEED MARTIN CORPORATION |  | 13074881 | 58260 | PROGRAM MANAGER ADVANCED ATTACK HELICOPTER BARCOM AMCPM-AAH | 
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 Techincal Specification:
 
 | AXIAL THICKNESS | 0.024 INCHES NOMINAL |  | DIAMETER | 1.066 INCHES NOMINAL |  | ELEMENT LEFT SURFACE RADIUS | 2.022 INCHES |  | ELEMENT RIGHT SURFACE RADIUS | 2.022 INCHES |  | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174, GRADE B MIL SPEC SINGLE MATERIAL RESPONSE |  | MATERIAL | GLASS OPTICAL |  | SINGLE LENS STYLE | DOUBLE CONCAVE | 
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