Breathing mask having a transducer movable parts coupled to a sp

Device for safeguarding the respiratory organs

Diver's microphone mask

Endotracheal tube including means for patient communication

Gas mask coupled to monolithic member with speech membrane

Gas mask with voice communication device

Heat resistant suit with active cooling system

Helmet system

Integrated control circuit for an oxygen mask

Mask

Microphone adaptor for a respirator

Microphone attenuation device for use in oxygen breathing masks

Microphone attenuation device for use in oxygen breathing masks

Microphone mounting structure for a sound amplifying respirator

Microphone mounting structure for a sound amplifying respirator

Microphone signal attenuating apparatus for oxygen masks

Moulded speech transmitter

Oxygen inhaler mask with sound pickup device

Protective breathing mask having a speaking diaphragm for close

Protective mask