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 6145-00-633-5159
NSN 6220-01-398-1406
NSN 5920-01-108-9400
NSN 5925-00-290-4451
NSN 6130-01-124-2934
NSN 5835-01-442-6482
NSN 6650-00-050-0476
NSN 5915-00-457-9296
NSN 5965-01-565-0640
NSN 6130-00-643-4894
NSN 5990-01-357-6175
NSN 6145-01-357-6288