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		                        | National Stock Number:
 1270-01-171-6918
 
 Federal Supply Class:
 1270
 
 National Item Identification Number:
 011716918
 
 Description:
 CELL,OPTICAL ELEMENT
 
 Detail:
 A CYLINDRICAL ITEM SPECIFICALLY DESIGNED TO HOLD A LENS, RETICLE, OR WINDOW IN AN OPTICAL SYSTEM. INCLUDES ECCENTRIC CELLS AND/OR RINGS DESIGNED TO BE ROTATED WITHIN THE INSTRUMENT TO SHIFT AN OPTICAL ELEMENT TO A PRESCRIBED POSITION.
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 Manufacturer Information:
 
 | 13074723 | 04939 | LOCKHEED MARTIN CORPORATION |  | 13074723 | 58260 | PROGRAM MANAGER ADVANCED ATTACK HELICOPTER BARCOM AMCPM-AAH | 
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 Techincal Specification:
 
 | MATERIAL | ALUMINUM ALLOY 6061 |  | OVERALL DIAMETER | 4.074 INCHES NOMINAL |  | OVERALL LENGTH | 0.355 INCHES MINIMUM AND 0.360 INCHES MAXIMUM | 
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