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 5960-00-050-0442
NSN 5895-01-514-5860
NSN 5965-01-179-7749
NSN 5905-00-231-9666
NSN 5960-00-297-7099
NSN 5930-00-960-4826
NSN 5990-00-503-0598
NSN 5999-01-406-3161
NSN 6150-00-854-5498
NSN 6220-01-202-8907
NSN 6110-01-221-6218
NSN 5920-00-518-0839