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 7035-00-543-3272
NSN 5915-01-316-0429
NSN 5895-00-366-0216
NSN 5985-00-094-6835
NSN 5996-01-602-3992
NSN 6110-01-551-5644
NSN 5996-01-044-6958
NSN 6645-01-286-9872
NSN 5999-01-342-9913
NSN 6110-00-775-6413
NSN 4140-01-307-2484
NSN 6220-01-625-6475