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.
Classification: Military equipments not identified by kind
NSN 5905-00-628-4931
NSN 4140-00-934-8800
NSN 4140-01-338-5984
NSN 5930-01-011-5776
NSN 5999-00-198-3959
NSN 2925-01-132-5827
NSN 5990-01-472-2447
NSN 6610-01-556-2353
NSN 5935-00-926-0587
NSN 5985-00-808-7122
NSN 5920-01-108-5168
NSN 6650-00-471-1117