US PATENT SUBCLASS 440 / 99
.~ Rotating outer hull

Current as of: June, 1999
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440 /   HD   MARINE PROPULSION

98  DF  BUOYANT PROPELLING MEANS {2}
99.~ Rotating outer hull

DEFINITION

Classification: 440/99

Rotating outer hull:

(under subclass 98) Device comprising a pair of hulls, one within the other, in which the outer hull, carrying or acting as the propelling means, rotates relative to the inner hull.