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 5996-01-314-6479
NSN 5985-00-725-5574
NSN 5905-01-311-0904
NSN 5990-01-127-1108
NSN 5965-00-913-9545
NSN 5905-01-253-6862
NSN 7035-01-388-6943
NSN 5985-01-266-5776
NSN 5835-01-537-1228
NSN 2925-00-215-0106
NSN 5835-00-752-1201
NSN 4140-01-641-1145