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 5935-01-274-2670
NSN 6620-01-349-4469
NSN 6130-00-945-1098
NSN 5920-00-100-1294
NSN 6620-00-155-2608
NSN 6220-01-431-7915
NSN 5925-01-079-8417
NSN 5905-00-259-8372
NSN 5935-01-110-4143
NSN 6320-01-436-0513
NSN 6240-00-034-5909
NSN 2925-00-470-5286