A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 6135-01-535-2307
NSN 5990-01-493-4039
NSN 6145-00-845-7965
NSN 5920-00-860-0456
NSN 5996-01-327-0220
NSN 5915-01-623-4502
NSN 5990-01-127-1108
NSN 5920-00-311-3953
NSN 6105-01-441-6732
NSN 7035-01-391-7470
NSN 6130-00-991-7462
NSN 5855-00-051-2792