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 6110-00-886-6519
NSN 6620-01-605-2590
NSN 5855-00-004-0904
NSN 5835-01-546-2008
NSN 5855-01-395-7429
NSN 6240-01-139-3377
NSN 6645-01-046-8849
NSN 6650-00-678-5627
NSN 7035-00-177-1557
NSN 5945-01-473-0434
NSN 4140-00-358-9965
NSN 5998-01-441-8208