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 5960-00-405-0486
NSN 6145-01-030-4944
NSN 5905-00-720-9983
NSN 5998-00-408-0972
NSN 5930-00-078-7826
NSN 5915-01-520-6900
NSN 5855-01-172-4568
NSN 5905-00-122-5513
NSN 6320-01-495-0512
NSN 5999-01-197-4382
NSN 5930-01-261-5272
NSN 7035-00-371-7749