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 5895-00-553-8345
NSN 5925-00-452-1270
NSN 5985-00-661-2263
NSN 5910-01-401-5279
NSN 6220-01-100-7428
NSN 5996-00-196-7258
NSN 5996-00-693-9568
NSN 5930-01-254-3819
NSN 5920-00-959-2810
NSN 5998-01-016-1453
NSN 5960-00-605-0226
NSN 5985-00-119-1896