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 6220-01-335-0201
NSN 5935-01-416-9587
NSN 5925-01-167-8144
NSN 5905-00-896-5204
NSN 2925-00-290-7052
NSN 6135-01-527-5494
NSN 6645-00-641-3202
NSN 5835-01-623-3328
NSN 5998-01-106-3077
NSN 6135-00-500-2082
NSN 5835-01-227-2318
NSN 5895-01-648-9723