4. Ships
  5. Building
  6. Canal and ferry boats

Walter J. Jankiewicz

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Automatically surfacing marker buoy for lobster or crab traps or

Ships – Building – Canal and ferry boats
Patent

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Milli-volt switching device

Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Electrodynamically actuated
Patent

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Profile ID: LFUS-PAI-P-780988

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