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 6105-00-451-1206
NSN 5835-00-484-1529
NSN 5975-01-092-7798
NSN 5935-01-065-3743
NSN 6135-01-454-9408
NSN 5855-00-548-4742
NSN 5999-01-027-0773
NSN 6610-01-015-9373
NSN 5930-01-487-5039
NSN 5835-01-150-6084
NSN 5930-00-124-2597
NSN 6650-00-754-2276