4. Marine propulsion
  5. Operator powered drive for propelling means
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Hand propulsion device for a paddle boat

Marine propulsion – Operator powered drive for propelling means – Rotary cranking arm
Patent

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Helical drive human powered boat

Marine propulsion – Operator powered drive for propelling means
Reexamination Certificate

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Human powered marine vehicle and method for the operation thereo

Marine propulsion – Operator powered drive for propelling means
Patent

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Human powered watercraft

Marine propulsion – Operator powered drive for propelling means – Sliding handle or pedal
Reexamination Certificate

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Human powered watercraft

Marine propulsion – Operator powered drive for propelling means – Lever with connecting linkage
Reexamination Certificate

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Human propelled buoyant annular float with removable pontoon sta

Marine propulsion – Operator powered drive for propelling means
Patent

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Human-powered or human-assisted energy generation and...

Marine propulsion – Operator powered drive for propelling means
Reexamination Certificate

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Humanly operable, recreational, readily disassemblable water cyc

Marine propulsion – Operator powered drive for propelling means – Rotary cranking arm
Patent

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