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 6650-00-170-5095
NSN 6150-00-794-8714
NSN 6610-01-051-4735
NSN 5935-01-391-4980
NSN 5965-01-558-4920
NSN 6130-01-115-5331
NSN 5990-01-042-8524
NSN 6240-01-300-3811
NSN 5998-01-410-3438
NSN 5905-01-230-3352
NSN 5855-01-308-0955
NSN 6320-00-731-6134