US PATENT SUBCLASS 440 / 59
.~.~.~ Screw type

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

49  DF  SCREW PROPELLER {12}
53  DF  .~ With means effecting or facilitating movement of propulsion unit or a segment of the propulsion unit (e.g., tilting or steering) {9}
58  DF  .~.~ Having toothed or threaded member to move propulsion unit or a segment of the propulsion unit {2}
59.~.~.~ Screw type

DEFINITION

Classification: 440/59

Screw type:

(under subclass 58) Device wherein the threaded member is an helically ridged member such as a threaded rod, worm, etc.

(1) Note. The screw may be fixed either on the propulsion unit or on the vessel.