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 5990-01-492-1114
NSN 6320-01-527-0211
NSN 6130-01-274-3601
NSN 5945-01-134-8246
NSN 6150-01-252-9833
NSN 5930-00-769-6924
NSN 6220-01-553-3160
NSN 6610-01-580-0766
NSN 5960-01-142-5399
NSN 5910-00-903-8999
NSN 6220-00-515-6998
NSN 5998-00-114-3961