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 5960-00-509-4549
NSN 6130-01-564-2470
NSN 6105-00-448-6927
NSN 6130-01-345-0350
NSN 6110-01-036-5485
NSN 5945-01-044-5291
NSN 5990-01-641-5782
NSN 6320-01-552-8721
NSN 5999-00-960-7155
NSN 6685-01-605-2497
NSN 6130-00-378-9889
NSN 6220-01-398-1406