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 4140-01-608-4315
NSN 6110-01-470-7688
NSN 5950-01-514-2881
NSN 5999-01-259-7826
NSN 4140-01-106-1080
NSN 6650-01-159-3461
NSN 6110-00-248-7475
NSN 5835-01-268-1924
NSN 6320-01-456-2859
NSN 5895-01-575-8930
NSN 5905-01-612-9462
NSN 6110-01-419-3179