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 5998-01-168-4055
NSN 5998-01-480-6995
NSN 7035-00-193-2269
NSN 5905-01-047-9423
NSN 5960-01-258-6708
NSN 5999-01-191-0332
NSN 6685-01-559-9954
NSN 6105-01-034-0138
NSN 5910-01-213-6383
NSN 6650-00-970-8110
NSN 5835-00-401-2578
NSN 5925-01-441-9512