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 5985-01-300-0481
NSN 5895-00-650-4778
NSN 6320-01-244-9268
NSN 6105-01-090-0661
NSN 6105-01-209-6234
NSN 5960-01-640-9971
NSN 5985-01-015-8650
NSN 6110-01-440-9158
NSN 5960-00-171-9575
NSN 6610-01-204-2571
NSN 5915-01-104-4977
NSN 5950-01-315-8837