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 2925-01-113-6904
NSN 5910-00-703-2390
NSN 5920-01-434-8504
NSN 5910-01-250-6592
NSN 5905-01-322-3372
NSN 6645-00-775-2172
NSN 5915-01-371-1450
NSN 5960-00-518-8204
NSN 6650-00-409-0907
NSN 6620-00-516-3204
NSN 5895-01-203-0448
NSN 6650-01-561-9223