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 4140-01-076-9775
NSN 5835-01-454-1823
NSN 5895-00-466-3100
NSN 5998-01-415-5163
NSN 6145-01-596-7027
NSN 6145-00-816-6166
NSN 5998-01-522-9920
NSN 5998-00-456-6385
NSN 5920-01-206-3977
NSN 5985-01-502-0950
NSN 6620-01-633-8443
NSN 6320-01-422-1212