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 5905-00-969-8992
NSN 6130-00-226-0417
NSN 6685-01-567-9425
NSN 5835-01-580-0446
NSN 5975-01-577-1944
NSN 5925-01-241-8464
NSN 6320-00-483-0451
NSN 6150-01-120-5618
NSN 6610-01-199-4795
NSN 6220-00-213-7548
NSN 5975-00-094-5959
NSN 5935-01-604-8561