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: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 5975-00-023-1937
NSN 6145-00-663-6133
NSN 5835-00-119-5585
NSN 5975-01-343-4447
NSN 6240-01-476-5776
NSN 5920-01-466-7766
NSN 5985-00-932-1630
NSN 2925-01-236-3547
NSN 5910-01-283-0604
NSN 6220-00-361-8338
NSN 6220-00-264-9473
NSN 6135-00-274-4037