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 5910-00-221-1463
NSN 5985-01-526-6473
NSN 6150-00-938-1543
NSN 6105-01-056-1208
NSN 5910-01-444-0859
NSN 5855-00-688-9954
NSN 5855-01-335-8907
NSN 5930-00-257-3288
NSN 5999-01-142-1941
NSN 5910-01-597-9558
NSN 5910-01-097-6692
NSN 5945-01-384-6201