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 5998-00-202-0071
NSN 6645-01-442-6476
NSN 5905-00-203-5913
NSN 5935-01-653-5615
NSN 5965-01-025-5129
NSN 6685-00-859-1362
NSN 5895-01-510-2931
NSN 5996-01-270-3679
NSN 5985-01-634-0635
NSN 5950-00-417-0852
NSN 6610-01-627-0642
NSN 2925-00-580-4931