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 6320-00-456-2092
NSN 5999-00-957-0204
NSN 5975-00-114-5354
NSN 5905-00-928-1672
NSN 7035-01-029-7221
NSN 5998-01-487-6993
NSN 5975-01-442-8767
NSN 5935-00-596-2684
NSN 5925-00-859-7942
NSN 6685-01-564-2421
NSN 5975-00-753-6864
NSN 6620-00-532-2068