4. Surgery
  5. Respiratory method or device
  6. Means for transmitting, or facilitating, voice communication...
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Speech diaphragm and exhalation valve

Surgery – Respiratory method or device – Means for transmitting – or facilitating – voice communication...
Patent

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Speech transmission adaptor for use with a respirator mask

Surgery – Respiratory method or device – Means for transmitting – or facilitating – voice communication...
Reexamination Certificate

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Speech transmission adaptor for use with a respirator mask

Surgery – Respiratory method or device – Means for transmitting – or facilitating – voice communication...
Reexamination Certificate

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