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 5990-01-534-8609
NSN 6220-01-125-0891
NSN 2925-01-157-9204
NSN 6145-01-145-5177
NSN 5895-01-031-0352
NSN 6620-01-591-6681
NSN 5990-00-153-0055
NSN 6145-01-491-0033
NSN 6650-00-054-4721
NSN 5965-00-150-1144
NSN 6645-00-629-9367
NSN 6645-00-527-6531