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 6240-00-350-4375
NSN 6610-00-005-0137
NSN 6105-01-448-4701
NSN 6650-00-624-3686
NSN 5975-00-262-0896
NSN 6685-01-501-5362
NSN 6650-00-023-5054
NSN 5975-01-227-6858
NSN 5950-01-016-5169
NSN 5965-00-568-5802
NSN 5910-01-287-9681
NSN 6145-01-108-7715