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 6150-01-391-5421
NSN 5920-00-226-7148
NSN 5925-01-519-9251
NSN 6130-00-843-5087
NSN 5990-00-608-4779
NSN 5930-00-694-9403
NSN 6135-01-265-1384
NSN 5999-01-352-5698
NSN 6650-01-510-4778
NSN 6110-01-652-3533
NSN 5945-01-464-6649
NSN 5990-01-185-9835