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 5950-00-737-0678
NSN 6110-01-168-7711
NSN 6650-01-581-1184
NSN 5965-00-204-8513
NSN 5960-00-351-4821
NSN 6620-01-131-2480
NSN 6220-01-419-1932
NSN 7035-01-245-7973
NSN 5895-01-408-1462
NSN 6320-01-072-2073
NSN 7035-01-364-8454
NSN 6685-00-082-1939