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 6105-01-200-8011
NSN 6135-01-614-1355
NSN 5905-00-555-1899
NSN 5945-01-423-0045
NSN 5990-01-322-9781
NSN 2925-01-394-5650
NSN 2925-01-394-1812
NSN 5910-01-206-1622
NSN 5950-01-236-9942
NSN 5905-00-065-5762
NSN 5905-01-482-1575
NSN 6620-00-932-4306