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 5915-01-181-5603
NSN 6220-01-316-8620
NSN 5910-01-535-1028
NSN 5985-00-419-0342
NSN 6130-01-421-2379
NSN 6110-00-778-3558
NSN 4140-01-056-1203
NSN 6145-00-016-8768
NSN 5910-01-571-8982
NSN 6240-01-371-3020
NSN 6145-01-252-7675
NSN 5999-00-884-6434