US PATENT SUBCLASS 244 / 17.23
.~.~ Having plural lifting rotors

Current as of: June, 1999
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244 /   HD   AERONAUTICS

4 R  DF  AIRCRAFT, HEAVIER-THAN-AIR {14}
17.11  DF  .~ Helicopter or auto-rotating wing sustained, i.e., gyroplanes {7}
17.23.~.~ Having plural lifting rotors

DEFINITION

Classification: 244/17.23

(under subclass 17.11) Gyroplanes which are provided with a plurality of rotating wings.

SEE OR SEARCH CLASS

416, Fluid Reaction Surfaces (i.e., Impellers),

120+, for plural impellers which are relatively movable and/or have different axes and in which only as much aircraft structure is claimed as is necessary to mount the impelling and/or steering means.