US PATENT SUBCLASS 244 / 17.15
.~.~ With safety lowering device

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}
17.15.~.~ With safety lowering device

DEFINITION

Classification: 244/17.15

(under subclass 17.11) Gyroplanes having means other than the rotor to allow lowering of the aircraft or in which the rotor is adjustable to allow the aircraft to be safely lowered.

SEE OR SEARCH THIS CLASS, SUBCLASS:

17.13, for safety lowering devices in which the rotor is automatically adjusted by condition responsive means.

138+, for safety lowering devices for airplanes.