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 5990-01-411-4596
NSN 6150-00-456-0775
NSN 5910-01-123-9850
NSN 6105-01-431-8998
NSN 5975-00-129-6056
NSN 5975-00-728-3224
NSN 6110-00-042-8365
NSN 5895-01-109-0865
NSN 5855-01-605-2438
NSN 5990-00-594-7291
NSN 6130-01-113-6715
NSN 5920-01-030-7311