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 6685-00-184-3894
NSN 5935-00-917-0703
NSN 5925-00-722-8930
NSN 6645-00-901-9281
NSN 5945-01-534-8405
NSN 5996-01-549-1157
NSN 5905-01-242-7412
NSN 5920-00-753-5113
NSN 6135-01-549-5587
NSN 5990-01-571-7468
NSN 5835-01-160-7282
NSN 6650-01-050-4809