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 5930-00-946-7283
NSN 5930-01-383-9793
NSN 4140-00-167-4712
NSN 6150-01-301-5885
NSN 4140-01-196-6331
NSN 5945-01-467-9886
NSN 5960-01-029-4253
NSN 5925-00-152-9399
NSN 5835-00-231-9544
NSN 5895-00-147-4101
NSN 5915-01-653-7259
NSN 6130-01-384-2191