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 5985-01-441-7039
NSN 5855-00-149-0766
NSN 6150-01-197-9063
NSN 6220-01-425-1132
NSN 6240-01-610-3341
NSN 5985-00-949-5691
NSN 6685-01-351-4586
NSN 5910-01-322-9497
NSN 5915-01-271-1187
NSN 5905-00-722-9222
NSN 5835-01-384-3206
NSN 6645-00-770-3742