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 5935-01-593-4887
NSN 6220-01-367-1877
NSN 6610-01-412-5776
NSN 7035-01-024-6419
NSN 4140-00-274-9638
NSN 6220-00-079-0178
NSN 6220-01-325-9212
NSN 4140-01-601-3464
NSN 5990-00-532-2641
NSN 5935-01-416-2813
NSN 6685-01-310-7193
NSN 5920-00-170-4247