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 5905-01-094-9702
NSN 5945-01-571-8903
NSN 5915-00-656-6976
NSN 5835-01-215-5961
NSN 6320-01-481-7322
NSN 6240-00-244-0483
NSN 5895-01-423-8486
NSN 6320-01-019-1028
NSN 5915-00-186-6490
NSN 4140-01-079-3584
NSN 6220-01-409-1585
NSN 5855-01-657-7657