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 6110-01-633-9660
NSN 6130-00-400-2989
NSN 5935-00-681-1120
NSN 6110-01-027-1501
NSN 4140-00-726-6062
NSN 5985-00-701-6446
NSN 5965-01-168-0150
NSN 5945-01-212-5480
NSN 6220-00-059-7607
NSN 6645-01-537-6994
NSN 5999-01-287-9215
NSN 5895-01-176-6983