US PATENT SUBCLASS 244 / 65
.~ Screw

Current as of: June, 1999
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244 /   HD   AERONAUTICS

62  DF  AIRCRAFT PROPULSION {7}
65.~ Screw {4}
66  DF  .~.~> Tilting
67  DF  .~.~> Body encircling
68  DF  .~.~> Elongated
69  DF  .~.~> Contra-propeller arrangements

DEFINITION

Classification: 244/65

(under subclass 62) The arrangement relative to aircraft and the combination with aircraft of devices using the effect of helical screws rotating in air for propelling aircraft.