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