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 5895-00-550-7608
NSN 5975-01-514-7605
NSN 6620-01-071-6020
NSN 5960-01-244-1969
NSN 5905-00-279-4178
NSN 6220-00-006-5157
NSN 5965-01-533-7687
NSN 6650-01-329-4742
NSN 6135-01-389-3525
NSN 4140-01-032-5746
NSN 5985-01-607-0049
NSN 5965-01-069-5650