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 5999-00-079-6624
NSN 5990-01-027-8260
NSN 5835-00-890-3932
NSN 5996-01-119-8234
NSN 5895-00-348-0508
NSN 5905-01-189-3101
NSN 6145-01-352-4471
NSN 6220-01-616-4492
NSN 5925-01-254-2578
NSN 6650-01-346-5935
NSN 6220-00-943-5129
NSN 6110-00-257-1446