4. Acoustics
  5. Speaking tubes

Jeffrey M. Ketchum

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Bubble silencer for an underwater voice communicator

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

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Tapered tube impedance matching underwater voice communicator wi

Acoustics – Speaking tubes
Patent

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Terrorist vehicle barrier

Road structure – process – or apparatus – Traffic steering device or barrier
Patent

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Profile ID: LFUS-PAI-P-1089009

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