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 6685-01-590-2705
NSN 5999-00-260-0471
NSN 7035-00-631-3782
NSN 4140-01-589-1092
NSN 4140-00-419-0631
NSN 5950-01-211-0138
NSN 6610-01-473-1843
NSN 6110-01-451-4326
NSN 5930-00-118-8081
NSN 2925-00-391-0331
NSN 5996-01-589-2391
NSN 5925-01-082-9349