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 4140-01-055-2900
NSN 6135-00-223-9563
NSN 6105-01-071-7670
NSN 6150-01-328-8604
NSN 5835-01-462-5983
NSN 5835-01-442-6482
NSN 5990-00-755-3015
NSN 4140-00-807-9902
NSN 5975-01-323-0523
NSN 5910-01-436-4527
NSN 5945-00-473-3254
NSN 6150-01-634-0575