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 6240-01-433-3648
NSN 6650-01-570-4795
NSN 6105-01-185-6462
NSN 6135-01-388-2761
NSN 6610-01-456-1166
NSN 4140-01-223-0116
NSN 6240-01-111-3394
NSN 5945-01-293-2561
NSN 5855-01-188-4049
NSN 5999-01-457-7445
NSN 6145-01-629-4079
NSN 5910-01-494-3929