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 5985-01-141-7059
NSN 5910-01-426-2043
NSN 5925-01-398-0013
NSN 6135-01-434-1790
NSN 6240-01-201-4314
NSN 5945-01-078-7472
NSN 5999-01-204-2365
NSN 2925-00-529-7081
NSN 5998-01-317-5202
NSN 6320-00-405-2348
NSN 6105-00-314-7767
NSN 6220-00-386-0997