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 5935-00-406-6416
NSN 5910-01-160-7848
NSN 4140-00-062-1335
NSN 5945-01-177-2366
NSN 6145-00-275-4046
NSN 6130-00-624-3447
NSN 6610-01-546-5499
NSN 5945-01-386-3208
NSN 2925-00-795-4063
NSN 2925-00-019-9649
NSN 6110-01-456-0725
NSN 6135-00-686-4777