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 5996-01-170-1915
NSN 5935-00-819-4560
NSN 5915-01-461-3089
NSN 6150-00-431-9694
NSN 5999-00-492-2123
NSN 6105-01-305-1729
NSN 6685-00-821-9858
NSN 5999-01-498-4843
NSN 5855-01-462-0495
NSN 6220-00-693-4777
NSN 7035-00-405-3502
NSN 5999-00-110-5394