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Protective breathing mask having a speaking diaphragm for close

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

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Protective mask

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

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Protective mask for airborne toxic substances

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