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 5915-01-233-2090
NSN 5915-01-425-7519
NSN 5835-01-508-2528
NSN 6105-01-387-5644
NSN 6685-01-026-0111
NSN 6135-01-435-5558
NSN 5920-01-284-8402
NSN 6145-01-478-1722
NSN 5960-00-688-7510
NSN 5855-01-562-2005
NSN 5910-01-300-3371
NSN 5985-01-480-3640