US PATENT SUBCLASS 434 / 220
.~ Air traffic control

Current as of: June, 1999
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434 /   HD   EDUCATION AND DEMONSTRATION

219  DF  OCCUPATION {8}
220.~ Air traffic control

DEFINITION

Classification: 434/220

Air traffic control:

(under subclass 219) Subject matter relating to guidance of airplanes along airways and during takeoff and landing.