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 6620-01-161-8039
NSN 6150-01-022-6163
NSN 5835-01-576-5307
NSN 6220-01-017-5492
NSN 5998-01-089-8180
NSN 6110-00-905-4858
NSN 5950-00-922-4145
NSN 5930-00-487-5000
NSN 6130-00-307-9718
NSN 6610-00-523-0837
NSN 5905-01-332-1006
NSN 5935-00-636-5923