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 5950-01-158-0014
NSN 5925-01-492-8354
NSN 5975-01-106-3595
NSN 5985-01-561-1939
NSN 5996-00-023-8705
NSN 5990-01-527-7640
NSN 6240-01-269-8454
NSN 5990-01-121-1175
NSN 2925-01-197-6777
NSN 5930-00-182-7617
NSN 6685-01-319-4545
NSN 5930-01-513-8519