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 5996-00-211-7010
NSN 6110-01-406-2934
NSN 5998-01-508-7482
NSN 5945-00-290-1779
NSN 5905-01-211-4079
NSN 6645-01-535-7136
NSN 5998-01-225-9204
NSN 5996-01-182-1125
NSN 5990-01-612-5323
NSN 6610-01-333-9032
NSN 5985-01-177-2370
NSN 6645-01-281-4842