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 5930-01-502-0035
NSN 5998-01-444-6870
NSN 5915-00-402-1214
NSN 5915-01-615-1675
NSN 6320-01-190-1397
NSN 5895-01-359-4279
NSN 5996-00-450-2103
NSN 5998-00-218-1360
NSN 6135-01-626-6325
NSN 5925-01-120-9109
NSN 5999-00-519-5455
NSN 4140-01-532-3713