4. Fishing, trapping, and vermin destroying
  5. Fishing
  6. Harpoons and spears

Philip W. Payne

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Bubble silencer for an underwater voice communicator

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent

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Diver's fish spear

Fishing – trapping – and vermin destroying – Fishing – Harpoons and spears
Patent

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Tapered tube impedance matching underwater voice communicator wi

Acoustics – Speaking tubes
Patent

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Profile ID: LFUS-PAI-P-757879

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