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 6220-01-461-2910
NSN 7035-01-250-5744
NSN 6220-01-234-7412
NSN 6320-01-495-0512
NSN 6110-00-401-7890
NSN 6105-01-656-6348
NSN 5999-01-042-6378
NSN 6220-01-215-2179
NSN 5990-00-428-1895
NSN 5925-00-780-2574
NSN 5999-01-604-4498
NSN 6145-00-264-2137