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 6650-00-717-8913
NSN 5975-01-044-5722
NSN 5996-01-178-4724
NSN 6645-01-513-0117
NSN 6685-00-509-5239
NSN 5996-01-371-2958
NSN 2925-01-123-5856
NSN 6130-01-415-9453
NSN 6145-01-254-2935
NSN 5895-01-421-1573
NSN 5895-01-156-8142
NSN 5925-00-717-6319