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 5920-01-464-8480
NSN 5996-01-227-8877
NSN 6110-01-106-5111
NSN 6135-01-255-4786
NSN 7035-00-991-6877
NSN 6145-00-232-0813
NSN 4140-01-243-0608
NSN 6145-00-455-7237
NSN 5999-01-039-3383
NSN 5915-00-621-7205
NSN 5915-00-053-2003
NSN 6150-01-223-4077