US PATENT SUBCLASS 440 / 70
.~.~ Hull concavity

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

49  DF  SCREW PROPELLER {12}
66  DF  .~ Having means to control flow around propeller {3}
70.~.~ Hull concavity

DEFINITION

Classification: 440/70

Hull concavity:

(under subclass 66) Device wherein the means to control the flow around the propeller is a recess shaped into the hull, generally near the stern, and in which the propeller is located.