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 5950-00-995-0331
NSN 5985-01-172-1022
NSN 5996-00-633-6912
NSN 5998-01-583-0480
NSN 5975-00-353-5589
NSN 7035-01-095-5454
NSN 6110-01-253-5886
NSN 5925-01-026-9649
NSN 5835-00-484-1529
NSN 5915-01-424-0767
NSN 6650-01-576-6512
NSN 5925-00-517-8512