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 5895-00-407-6954
NSN 6130-00-185-3056
NSN 5835-01-406-4066
NSN 5915-01-008-6268
NSN 6105-00-082-1945
NSN 6320-01-141-3791
NSN 5960-01-159-4343
NSN 5996-00-277-7384
NSN 5915-00-312-8011
NSN 5999-01-647-6316
NSN 5910-01-097-9913
NSN 6135-00-125-5265