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 6220-01-408-3017
NSN 7035-00-803-3056
NSN 6320-01-204-2922
NSN 5915-01-268-0930
NSN 6610-00-406-8544
NSN 6620-00-600-9869
NSN 5925-01-363-7765
NSN 5910-00-875-7101
NSN 7035-01-431-4560
NSN 5996-01-032-5926
NSN 5905-01-607-0118
NSN 5935-01-328-8558