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 5950-00-088-6022
NSN 6110-01-555-8410
NSN 5985-00-277-7371
NSN 5999-01-563-6601
NSN 5895-00-725-2702
NSN 5960-01-632-6576
NSN 5965-00-455-7581
NSN 5895-00-199-0515
NSN 6105-01-179-6563
NSN 6220-01-381-1074
NSN 5975-01-235-5111
NSN 5975-01-282-2277