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 5996-01-633-7979
NSN 5935-01-380-1912
NSN 5855-00-337-3679
NSN 6110-01-367-2165
NSN 6650-01-384-1657
NSN 5895-01-508-4343
NSN 6620-01-629-4045
NSN 6240-01-344-7134
NSN 5930-00-035-4739
NSN 5950-01-108-3111
NSN 5965-00-170-5254
NSN 5935-00-675-8974