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 6150-00-740-8011
NSN 5945-00-553-9963
NSN 5910-00-741-2715
NSN 6240-01-400-2935
NSN 6320-01-006-6138
NSN 6135-01-616-9489
NSN 6620-01-514-2801
NSN 7035-00-803-3056
NSN 5835-01-279-9508
NSN 5895-00-757-5367
NSN 6620-01-206-8919
NSN 6240-01-023-7720