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 5960-01-364-9795
NSN 5910-01-274-7482
NSN 5835-01-202-1376
NSN 6685-01-585-3050
NSN 5999-01-130-6262
NSN 6130-01-564-0234
NSN 5998-01-242-6782
NSN 6650-00-601-8944
NSN 5998-01-338-1390
NSN 6150-00-485-2878
NSN 6240-00-494-0927
NSN 6685-01-054-9054