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 5975-00-642-8959
NSN 6650-00-034-8438
NSN 6645-01-175-2155
NSN 6610-00-325-0485
NSN 5975-00-930-4529
NSN 6645-00-270-6817
NSN 4140-01-420-0354
NSN 5996-00-823-9164
NSN 5960-00-389-2915
NSN 5930-00-888-9865
NSN 6150-01-467-2380
NSN 6105-00-050-4373