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 5985-00-927-8056
NSN 5935-01-171-2402
NSN 6240-00-878-1965
NSN 4140-00-200-9082
NSN 5975-01-328-3677
NSN 5855-01-278-4868
NSN 5855-01-435-5548
NSN 6320-00-004-9158
NSN 5945-00-959-3149
NSN 6610-01-252-8201
NSN 6130-01-322-4087
NSN 6610-00-761-5942