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 5990-00-320-2779
NSN 5985-01-335-3329
NSN 5895-01-398-0063
NSN 5999-01-529-8935
NSN 5930-00-008-3092
NSN 5975-01-360-7086
NSN 4140-01-227-1342
NSN 5855-01-464-5084
NSN 5996-00-222-6049
NSN 5996-01-127-1734
NSN 5910-01-068-2674
NSN 6220-01-379-4528