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 6150-01-458-9939
NSN 5835-00-111-3419
NSN 7035-00-703-3535
NSN 5915-00-041-0296
NSN 6220-01-122-3155
NSN 6685-01-573-8072
NSN 6645-01-146-3323
NSN 5990-00-949-7376
NSN 6685-00-824-7910
NSN 6110-01-106-0182
NSN 5935-00-398-1584
NSN 6650-01-322-1963