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 5999-01-399-0249
NSN 5905-01-431-9177
NSN 5985-01-350-3454
NSN 5985-00-518-1748
NSN 2925-01-218-5556
NSN 5920-01-314-9517
NSN 5999-01-659-6120
NSN 5895-01-124-8430
NSN 6130-01-400-1122
NSN 5990-01-455-2919
NSN 6135-01-054-2462
NSN 6135-00-900-2139