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 5985-01-521-2873
NSN 6620-01-585-3982
NSN 7035-00-020-2227
NSN 5985-00-482-4277
NSN 5998-01-646-3162
NSN 6620-01-025-4690
NSN 5935-01-027-0915
NSN 6650-00-104-5368
NSN 5925-01-595-9348
NSN 5990-01-507-1479
NSN 5975-00-524-8644
NSN 6650-00-266-6604