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 6150-01-550-4862
NSN 5990-01-309-3740
NSN 6135-00-016-0071
NSN 5985-01-315-1931
NSN 5965-01-452-4039
NSN 6610-01-426-5090
NSN 5915-00-536-3379
NSN 5910-00-100-1496
NSN 5915-01-413-4784
NSN 6650-01-328-8363
NSN 6240-01-160-7430
NSN 6240-00-146-9322