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 5965-01-576-6975
NSN 6240-01-500-6260
NSN 5895-00-571-8055
NSN 5999-01-381-2457
NSN 5999-01-605-0272
NSN 5996-01-351-6485
NSN 5996-01-547-9155
NSN 5985-01-627-5240
NSN 5990-01-207-6524
NSN 5960-01-268-8674
NSN 6320-00-405-2348
NSN 6650-00-578-6543