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 6220-01-274-7788
NSN 6110-01-300-9212
NSN 5925-00-284-3726
NSN 6145-01-652-9956
NSN 5895-01-168-0318
NSN 5965-00-905-7561
NSN 2925-00-355-5130
NSN 6650-01-406-3086
NSN 5996-01-323-9370
NSN 5915-01-072-0698
NSN 4140-00-464-7890
NSN 6130-01-543-9727