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 6110-00-659-3348
NSN 5975-01-127-9865
NSN 5950-01-381-1988
NSN 6110-01-582-7536
NSN 5960-01-462-1864
NSN 7035-01-472-8658
NSN 5990-01-087-7081
NSN 5965-01-411-9933
NSN 5835-00-372-3736
NSN 6240-00-292-3237
NSN 6240-00-443-8000
NSN 6645-01-176-2430