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 6650-00-140-8776
NSN 6610-00-136-2662
NSN 5960-00-229-5121
NSN 6620-00-888-3179
NSN 6105-00-353-5594
NSN 5950-00-679-0876
NSN 6135-01-408-9244
NSN 5935-01-464-4997
NSN 6645-01-202-7986
NSN 5910-00-932-6862
NSN 6650-00-264-0664
NSN 6650-01-406-4451