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 5965-01-051-0126
NSN 5935-01-060-2219
NSN 5945-00-265-1762
NSN 6135-01-177-3552
NSN 5950-00-246-6362
NSN 6145-00-196-1394
NSN 6110-01-552-6380
NSN 5990-01-164-0220
NSN 5998-01-633-4791
NSN 6145-01-106-9646
NSN 6645-00-315-9254
NSN 5945-01-171-9065