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Mask

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

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Microphone adaptor for a respirator

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

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Microphone attenuation device for use in oxygen breathing masks

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

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Microphone attenuation device for use in oxygen breathing masks

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

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Microphone mounting structure for a sound amplifying respirator

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

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Microphone mounting structure for a sound amplifying respirator

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

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Microphone signal attenuating apparatus for oxygen masks

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

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Moulded speech transmitter

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

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