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 6610-01-615-0979
NSN 6150-01-055-6545
NSN 6220-01-023-8818
NSN 5920-01-318-4111
NSN 6645-00-908-0140
NSN 5960-00-233-5488
NSN 5925-00-316-5312
NSN 7035-00-585-2113
NSN 5895-01-445-1432
NSN 5915-01-407-3355
NSN 5996-00-318-3405
NSN 6110-01-588-0354