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 5950-01-047-3780
NSN 2925-01-541-5031
NSN 6240-01-616-3334
NSN 6130-00-518-1884
NSN 5999-01-408-9906
NSN 5910-00-236-1674
NSN 5960-01-392-5993
NSN 6610-01-556-2353
NSN 5998-01-464-3097
NSN 6240-00-243-0340
NSN 5985-00-153-0864
NSN 5999-00-258-5314