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 5935-01-328-5478
NSN 5835-01-132-5894
NSN 5985-00-195-6090
NSN 5996-01-607-7035
NSN 6110-01-115-6912
NSN 5935-00-515-6967
NSN 5998-01-538-3174
NSN 5920-00-140-8912
NSN 6130-00-244-7593
NSN 6220-00-961-7246
NSN 6135-00-767-0331
NSN 5996-00-931-5019