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 5945-01-351-7134
NSN 5835-01-507-0731
NSN 6620-01-608-2682
NSN 6110-01-598-6963
NSN 4140-01-266-7888
NSN 2925-00-674-8608
NSN 6650-01-369-6536
NSN 5935-00-793-0244
NSN 6135-01-251-7054
NSN 5925-01-524-8058
NSN 5930-00-157-4559
NSN 6130-00-478-6971