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 6135-01-483-1501
NSN 7035-00-442-1869
NSN 5855-01-027-1571
NSN 6620-01-462-0001
NSN 6240-00-404-7935
NSN 5996-01-032-2236
NSN 6105-01-513-0310
NSN 5835-00-007-6824
NSN 5996-01-633-7979
NSN 5965-01-474-1134
NSN 5950-01-284-0506
NSN 4140-01-357-1922