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 4140-00-293-7847
NSN 5990-01-068-1651
NSN 6220-01-197-5668
NSN 5915-00-508-1259
NSN 6610-01-298-1517
NSN 6105-00-252-3233
NSN 5975-01-160-8458
NSN 6620-00-484-4662
NSN 5975-00-476-6234
NSN 6135-00-998-5884
NSN 2925-00-238-1668
NSN 5910-01-246-3873