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 5925-00-391-6987
NSN 6610-00-131-2076
NSN 5996-01-147-6054
NSN 5999-01-519-8595
NSN 5930-00-422-1188
NSN 5835-01-462-5983
NSN 2925-01-233-8545
NSN 5895-01-168-1373
NSN 7035-01-519-9270
NSN 5945-00-718-0164
NSN 6620-00-075-6667
NSN 7035-01-192-9989