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 5930-01-069-2776
NSN 6135-00-405-1989
NSN 2925-00-912-3993
NSN 5999-01-463-9225
NSN 5855-00-361-0167
NSN 5855-01-456-8667
NSN 6240-01-558-4104
NSN 6135-01-100-3593
NSN 6150-00-918-3666
NSN 4140-00-942-1317
NSN 2925-01-415-2140
NSN 5910-00-577-0040