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 6150-00-889-1245
NSN 5835-00-092-1136
NSN 6240-01-028-0987
NSN 5920-01-330-0486
NSN 5965-01-580-7410
NSN 6610-00-270-9974
NSN 5930-00-802-6038
NSN 5990-01-644-3095
NSN 5930-01-657-4529
NSN 5835-01-227-2318
NSN 5835-00-016-3671
NSN 6620-00-280-2874