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 6650-00-751-9958
NSN 5935-01-453-0888
NSN 5999-01-312-1196
NSN 5996-01-547-3452
NSN 5996-00-035-5624
NSN 5935-01-264-9264
NSN 5835-01-170-0271
NSN 5945-01-208-6358
NSN 4140-01-576-9796
NSN 5920-01-422-1866
NSN 6610-00-288-5655
NSN 5935-01-479-6756