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 5920-01-541-3663
NSN 5835-00-453-1969
NSN 5975-01-426-3279
NSN 5835-01-457-7951
NSN 5895-01-116-4632
NSN 5975-01-411-6054
NSN 6320-01-563-8525
NSN 5996-01-565-8951
NSN 5835-01-235-1125
NSN 5985-00-494-1824
NSN 5920-01-153-0759
NSN 4140-01-352-8059