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 6685-01-567-8772
NSN 6135-00-871-3646
NSN 6650-00-379-5434
NSN 5998-01-428-9545
NSN 5960-01-429-5897
NSN 5998-01-521-8488
NSN 4140-01-441-2339
NSN 5999-01-494-5014
NSN 5975-01-302-3650
NSN 6645-01-381-2050
NSN 6135-01-077-5705
NSN 5950-00-123-8474