US PATENT SUBCLASS 244 / 12.3
.~.~ Dual propulsion

Current as of: June, 1999
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244 /   HD   AERONAUTICS

4 R  DF  AIRCRAFT, HEAVIER-THAN-AIR {14}
12.1  DF  .~ Airplane and fluid sustained {5}
12.3.~.~ Dual propulsion

DEFINITION

Classification: 244/12.3

Dual propulsion:

(under subclass 12.1) Apparatus wherein the aeronautical machine comprises separate and distinct power plants or motive means, at least one of the motive means being used solely for forward or horizontal propulsion and at least one other motive means solely for lift or vertical propulsion.