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 5835-00-168-4258
NSN 6130-01-486-0549
NSN 6145-00-563-1103
NSN 5910-01-627-2152
NSN 5835-00-155-1379
NSN 5910-01-263-9860
NSN 5999-01-018-5964
NSN 5855-00-318-7185
NSN 5925-01-412-3733
NSN 2925-01-528-7333
NSN 5925-01-522-7133
NSN 6135-01-119-0720