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 6620-00-319-4044
NSN 5945-01-614-3743
NSN 5895-01-278-3756
NSN 5998-00-721-4701
NSN 6130-01-406-4769
NSN 5965-01-064-0263
NSN 6145-01-640-9122
NSN 2925-01-434-6945
NSN 5935-01-056-2259
NSN 6320-01-232-4664
NSN 5895-00-393-2512
NSN 5925-00-494-4685