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 5960-01-632-6576
NSN 5999-00-617-2830
NSN 5935-00-611-4442
NSN 6150-01-129-2952
NSN 5935-01-103-3495
NSN 5895-01-520-7476
NSN 5975-01-088-9960
NSN 6620-01-566-3456
NSN 7035-01-371-0091
NSN 2925-01-502-2385
NSN 5930-01-508-6059
NSN 6620-01-130-5700