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 5895-01-462-4199
NSN 6110-01-352-6233
NSN 5985-01-502-6097
NSN 6220-01-398-6202
NSN 5930-01-170-8112
NSN 5910-01-033-2824
NSN 5930-01-094-9061
NSN 6650-01-579-3855
NSN 6135-00-681-2702
NSN 6135-01-247-5660
NSN 5950-01-619-8212
NSN 5945-01-155-8681