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 6620-01-574-1862
NSN 6145-00-117-8861
NSN 5990-01-411-5930
NSN 6135-01-535-9092
NSN 5996-01-475-2261
NSN 6685-00-549-6438
NSN 6145-01-631-1788
NSN 6150-00-232-9524
NSN 7035-01-435-7962
NSN 5935-01-500-1827
NSN 5960-01-472-9562
NSN 4140-01-371-7495