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 5925-00-999-9320
NSN 6135-00-995-1089
NSN 6320-01-418-6681
NSN 6240-00-442-6327
NSN 4140-01-415-1187
NSN 5960-00-161-9345
NSN 6220-01-367-0832
NSN 6145-01-532-8805
NSN 5965-01-025-4677
NSN 6685-01-364-8552
NSN 5985-01-168-3405
NSN 5895-00-564-2892