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 5990-01-432-4984
NSN 6220-01-454-4022
NSN 6240-01-224-7656
NSN 6130-01-339-5504
NSN 5905-00-266-0975
NSN 6150-00-596-9882
NSN 6145-00-756-2963
NSN 5965-01-312-1630
NSN 5905-00-881-1369
NSN 6130-01-598-1193
NSN 6620-01-476-7355
NSN 5925-01-434-1094