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 5930-00-369-1454
NSN 5965-01-630-0409
NSN 6130-00-806-6625
NSN 6610-01-214-6680
NSN 5960-01-342-1961
NSN 6145-01-139-2158
NSN 6105-01-056-3074
NSN 6220-01-294-0764
NSN 5855-01-342-9778
NSN 5999-00-721-4116
NSN 5985-01-210-6803
NSN 6645-01-409-2003