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 5960-01-472-9562
NSN 5998-01-538-4288
NSN 6685-01-372-3393
NSN 5925-01-595-6276
NSN 5905-00-144-2347
NSN 6110-01-370-4234
NSN 6145-01-496-3060
NSN 5935-01-279-2495
NSN 5915-01-266-3143
NSN 4140-01-534-9987
NSN 6645-01-052-8331
NSN 5835-00-233-6327