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 5920-01-064-0939
NSN 6610-00-437-5681
NSN 7035-01-514-4617
NSN 6645-00-086-9346
NSN 5990-00-140-4559
NSN 5950-00-459-7875
NSN 5915-01-443-8662
NSN 5895-01-548-1029
NSN 5925-01-515-1378
NSN 5965-01-003-2641
NSN 5920-01-233-8373
NSN 5950-01-179-3156