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 6620-01-014-6913
NSN 6240-01-605-1799
NSN 6150-01-525-8028
NSN 5945-01-513-9686
NSN 5895-01-207-5038
NSN 5915-01-312-4184
NSN 5935-00-953-3116
NSN 4140-01-224-8715
NSN 5920-01-346-4777
NSN 4140-00-356-1639
NSN 6320-01-643-0850
NSN 6220-01-046-7485