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 4140-01-259-9260
NSN 5835-00-905-7165
NSN 6130-00-913-2395
NSN 6145-01-338-5671
NSN 5960-01-578-5537
NSN 6620-01-633-8443
NSN 6220-01-317-3283
NSN 6135-01-496-2352
NSN 6135-01-546-4588
NSN 7035-01-354-7056
NSN 6145-01-474-7289
NSN 6610-01-423-7481