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 7035-00-421-8710
NSN 6650-01-437-5214
NSN 6110-00-456-2058
NSN 5999-01-305-8543
NSN 5855-00-560-0110
NSN 5960-01-085-4231
NSN 2925-00-836-9543
NSN 5855-00-560-0110
NSN 5935-00-568-8596
NSN 6110-01-093-1776
NSN 6145-00-914-0517
NSN 5895-00-961-6329