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 5998-01-441-0119
NSN 6240-01-656-1126
NSN 5910-01-157-0887
NSN 5895-00-740-7461
NSN 6240-01-462-1874
NSN 5996-01-435-5547
NSN 5999-01-298-9053
NSN 5945-00-176-0545
NSN 5996-01-570-8798
NSN 5915-01-286-2834
NSN 5835-01-058-0233
NSN 5999-00-593-8817