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 5975-00-910-3461
NSN 6130-00-436-0777
NSN 5910-01-406-3880
NSN 6620-00-162-9877
NSN 6110-01-371-3477
NSN 6650-01-553-2805
NSN 6220-01-357-6872
NSN 4140-00-949-8572
NSN 5835-00-550-7728
NSN 7035-00-250-0982
NSN 4140-00-174-8844
NSN 5945-00-110-4946