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 5935-01-441-9578
NSN 4140-00-193-0067
NSN 5998-00-013-9124
NSN 6685-01-556-0484
NSN 5960-00-912-9285
NSN 5855-00-688-9954
NSN 2925-00-909-1254
NSN 5960-01-552-0862
NSN 6620-00-104-6937
NSN 6135-01-599-7563
NSN 7035-01-187-0266
NSN 6135-01-510-9986