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 6145-01-169-2868
NSN 5930-01-522-6589
NSN 5835-00-752-1201
NSN 6645-00-163-9580
NSN 6610-01-380-2087
NSN 5998-01-598-8728
NSN 6320-00-116-3658
NSN 5935-01-621-4726
NSN 6135-01-238-2878
NSN 5855-01-439-1838
NSN 6650-01-563-3961
NSN 7035-01-609-3839