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 5950-01-209-9555
NSN
NSN 6685-01-444-9932
NSN 5920-00-567-4100
NSN 6650-00-098-6128
NSN 6130-01-379-0418
NSN 6685-01-228-0175
NSN 5945-01-142-3321
NSN 6610-01-310-3313
NSN 5990-01-183-1897
NSN 5990-01-381-9526
NSN 7035-01-434-0606