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 5930-01-509-7962
NSN 5996-01-193-5974
NSN 6220-00-420-1245
NSN 5910-01-116-0852
NSN 5920-01-268-7258
NSN 5935-01-050-7487
NSN 5855-00-631-4565
NSN 6130-00-060-8675
NSN 5925-01-219-8906
NSN 5915-00-854-3120
NSN 5998-01-629-7247
NSN 6240-01-354-2626