US PATENT SUBCLASS 440 / 56
.~.~.~ With releasing means when propulsion unit hits obstruction

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}
55  DF  .~.~ Having restraining means {1}
56.~.~.~ With releasing means when propulsion unit hits obstruction

DEFINITION

Classification: 440/56

With releasing means when propulsion unit hits obstruction:

(under subclass 55) Device wherein a means is provided to unfasten the restraining means when the propulsion unit comes in contact with a submerged impediment.