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 6220-01-446-3508
NSN 6110-01-499-1282
NSN 6145-01-260-3590
NSN 6110-01-159-9721
NSN 7035-01-413-3975
NSN 5999-01-015-3891
NSN 6320-00-483-0451
NSN 5950-01-192-3881
NSN 5975-01-529-7752
NSN 5895-00-636-4842
NSN 5895-01-502-6208
NSN 6220-01-645-2625