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 6130-00-133-7712
NSN 5960-01-495-0859
NSN 5996-01-547-6638
NSN 6220-01-020-8703
NSN 5930-00-065-8035
NSN 5999-00-385-1722
NSN 6145-01-398-7451
NSN 6135-01-407-0594
NSN 5925-00-739-7460
NSN 5835-01-041-0585
NSN 5930-01-604-8783
NSN 5930-01-459-7104