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 6620-01-633-8443
NSN 5999-01-574-3499
NSN 6650-01-487-6274
NSN 6145-01-033-6068
NSN 6150-01-603-0519
NSN 5895-01-393-1517
NSN 6320-00-725-0754
NSN 6320-01-064-0372
NSN 5920-00-203-5938
NSN 7035-00-981-5425
NSN 5999-00-999-4435
NSN 5855-01-447-7168