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 5985-00-199-8997
NSN 5835-01-555-8963
NSN 5930-01-553-6037
NSN 5915-00-874-6606
NSN 2925-00-486-8640
NSN 5985-00-070-0484
NSN 5915-01-410-6838
NSN 5990-01-411-5930
NSN 5998-00-195-4555
NSN 5990-01-142-0538
NSN 2925-01-065-0060
NSN 5910-01-394-3729