US PATENT SUBCLASS 434 / 50
.~.~.~ Takeoff or preparation therefor

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

29  DF  VEHICLE OPERATOR INSTRUCTION OR TESTING {4}
30  DF  .~ Flight vehicle {14}
49  DF  .~.~ Aircraft or ambient condition simulated electrically or indicated by instrument or alarm {5}
50.~.~.~ Takeoff or preparation therefor

DEFINITION

Classification: 434/50

Takeoff or preparation therefor:

(under subclass 49) Subject matter wherein departure of an aircraft from the ground, or preparation therefor is imitated.