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 5996-01-264-8463
NSN 6610-01-481-9575
NSN 5835-01-469-6706
NSN 5915-00-891-2465
NSN 5960-01-003-8480
NSN 5925-00-529-3950
NSN 5915-01-258-7435
NSN 5915-01-628-5474
NSN 6135-00-432-8779
NSN 6135-01-322-4655
NSN 6145-01-104-2871
NSN 5945-01-577-0113