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 6150-00-912-2010
NSN 6610-00-230-1810
NSN 6645-01-349-1631
NSN 5965-01-350-5105
NSN 6240-00-370-5862
NSN 5855-01-364-1005
NSN 6130-01-118-8245
NSN 5950-00-216-7548
NSN 5999-00-664-1818
NSN 5985-01-343-9397
NSN 5998-01-335-8466
NSN 5960-00-768-3746