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 6220-01-560-8821
NSN 6110-01-543-9660
NSN 5996-00-342-4923
NSN 5910-00-028-8104
NSN 5998-01-507-0419
NSN 6320-01-158-2177
NSN 4140-00-067-4798
NSN 5990-01-416-0362
NSN 6150-00-516-8445
NSN 5930-01-036-8779
NSN 6650-00-400-8371
NSN 5925-01-503-6177