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 5915-01-599-4159
NSN 6240-01-641-0816
NSN 5950-01-142-6960
NSN 2925-00-679-8131
NSN 6645-01-571-6404
NSN 6110-01-490-6575
NSN 5895-01-461-8287
NSN 5910-01-327-2720
NSN 5910-00-337-6276
NSN 6645-01-463-3441
NSN 5998-00-572-1616
NSN 5975-00-711-8805