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		                        | National Stock Number:
 1240-01-186-1796
 
 Federal Supply Class:
 1240
 
 National Item Identification Number:
 011861796
 
 Description:
 WINDOW,OPTICAL INSTRUMENT
 
 Detail:
 A COLOR FREE ITEM OF TRANSPARENT OR TRANSLUCENT MATERIAL, USUALLY OPTICAL GLASS, HAVING SPECIFIC LIGHT DISPERSIVE AND REFRACTIVE PROPERTIES. THIS ITEM MUST HAVE TWO PLANE-PARALLEL SURFACES AND IS DESIGNED FOR USE IN AN OPTICAL INSTRUMENT TO PROVIDE A BARRIER TO FOREIGN MATTER AND/OR PERMIT LIGHT TRANSMISSION IN OR TO THE OPTICAL SYSTEM.
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 Manufacturer Information:
 
 | 242387 | 09205 | LOCKHEED MARTIN CORP ELECTRONICS AND MISSILES DIV |  | 242387 | 22669 | COHERENT AEROSPACE & DEFENSE, INC. |  | 242387 | 46555 | APPLIED BIOSYSTEMS, LLC |  | 242387 | 8F963 | GOODRICH CORPORATION | 
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 Techincal Specification:
 
 | CRITICALITY CODE JUSTIFICATION | FEAT |  | LENGTH | 6.712 INCHES NOMINAL |  | MATERIAL | GLASS OPTICAL LOCATION NOT OTHERWISE SPECIFIED |  | POLISHED PERIPHERY | NOT PROVIDED |  | SPECIAL FEATURES | WEAPON SYSTEM ESSENTIAL |  | THICKNESS | 0.390 INCHES NOMINAL |  | WIDTH | 6.461 INCHES NOMINAL | 
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