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 5999-01-106-1649
NSN 5905-00-509-7015
NSN 5945-01-552-7575
NSN 5990-00-301-3386
NSN 5945-01-097-7759
NSN 5985-01-317-5801
NSN 6105-01-347-4477
NSN 5915-00-573-9041
NSN 5930-00-889-8605
NSN 5960-00-584-4553
NSN 5925-00-467-1738
NSN 5910-01-137-1608