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 6145-01-131-8557
NSN 6145-01-162-3131
NSN 6135-01-435-6503
NSN 6645-00-867-6724
NSN 6240-01-421-4025
NSN 5945-00-942-1311
NSN 5855-01-411-3360
NSN 6135-00-491-9864
NSN 5960-00-018-3477
NSN 5895-01-314-6223
NSN 6320-01-454-1965
NSN 5975-01-440-6989