US PATENT SUBCLASS 440 / 69
.~.~.~ With open bottom


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}
68  DF  .~.~ Hull channel {1}
69.~.~.~ With open bottom


DEFINITION

Classification: 440/69

With open bottom:

(under subclass 68) Device wherein the lowermost side of the channel is removed.