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Fetal communication device

Acoustics – Speaking tubes – Mouthpieces
Patent

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Mask/microphone system for voice actuated control

Acoustics – Speaking tubes – Mouthpieces
Patent

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Personal removable mouthpiece for a voice amplification instrume

Acoustics – Speaking tubes – Mouthpieces
Patent

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Underwater voice communicator

Acoustics – Speaking tubes – Mouthpieces
Patent

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