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 5910-01-530-9561
NSN 5835-00-814-1359
NSN 5910-00-378-0766
NSN 5905-01-384-2154
NSN 6610-00-278-7647
NSN 5950-01-147-4816
NSN 5920-01-566-4914
NSN 6105-00-837-8056
NSN 4140-00-229-0915
NSN 5910-01-434-7726
NSN 6320-01-449-1014
NSN 6240-01-458-2140