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 5935-01-252-0715
NSN 7035-00-931-9415
NSN 5999-01-441-9308
NSN 5915-00-267-9070
NSN 6610-01-265-1824
NSN 6130-00-605-7087
NSN 6320-01-272-7072
NSN 6145-01-624-0654
NSN 5835-00-264-0946
NSN 5915-01-537-9299
NSN 2925-00-909-2596
NSN 5999-00-851-6787