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 5910-00-554-1422
NSN 5985-01-399-0307
NSN 5915-01-474-1937
NSN 5895-01-421-4117
NSN 5910-01-629-9909
NSN 5999-00-909-8808
NSN 5999-01-428-4012
NSN 5945-00-913-2747
NSN 6220-01-316-1845
NSN 5905-01-188-8244
NSN 6145-01-321-2334
NSN 5996-00-636-4849