Underwater mask with combination speaking diaphragm and demand valve

Claim 1

AN UNDERWATER BREATHING AND COMMUNICATING MASK COMPRISING A RESILIENT FACE FRAME, SAID FRAME INCLUDING A REAR PERIPHERAL EDGE CONTOURED FOR SEALING CONTACT WITH THE FACE OF A USER, A TRANSVERSE PARTITION SPANNING SAID FRAME AT THE FORWARD PORTION THEREOF AND DIVIDING SAID MASK INTO DISTINCT UPPER AND LOWER CHAMBERS, SAID LOWER CHAMBER CONSTITUTING AN AIR CHAMBER AND BEING OF A SIZE SO AS TO CLOSELY CONFORM TO THE NOSE AN MOUTH AREA OF A USER''S FACE, AT LEAST THE CENTRAL PORTION OF THE PARTITION ARCHING UPWARDLY TO OVERLIE AND CONFINE THE NOSE OF A USER WITHIN THE LOWER CHAMBER, SAID UPPER CHAMBER BEING SUBSTANTIALLY LARGER THAN THE LOWER CHAMBER AND CONSTITUTING A VIEWING CHAMBER, A TRANSPARENT PLATE FORMING THE FORWARD WALL OF THE VIEWING CHAMBER, SAID TRANSPARENT PLATE BEING PERIPHERALLY SEALED TO THE UPPER PORTION OF THE FORWARD EDGE OF THE FRAME AND THE UPPER PORTION OF THE PARTITION CONSTITUTING THE LOWER LEVEL OF THE VIEWING CHAMBER, A VALVE-CONTROLLED AIR INTAKE COMMUNICATED WITH THE LOWER AIR CHAMBER AND A VALVE-CONTROLLED AIR EXHAUST COMMUNICATED WITH THE LOWER AIR CHAMBER WHEREBY A MOVEMENT OF BREATHING AIR INTO AND OUT OF THE AIR CHAMBER CAN BE EFFECTED INDEPENDENT OF THE VIEWING CHAMBER, A FLEXIBLE SOUND RESPONSIVE VIBRATING DIAPHRAGM FORMING THE FORWARD WALL OF THE AIR CHAMBER FOR ORIENTATION IMMEDIATELY FORWARD OF THE MOUTH OF A USER FOR A SOUND TRANSMITTING VIBRATION IN RESPONSE TO SOUNDS EMITTING FROM THE MOUTH OF A USER, LINK MEANS CONNECTING THE DIAPHRAGM AND THE VALVE CONTROL FOR THE INTAKE FOR EFFECTING AN OPENING OF THE AIR INTAKE IN RESPONSE TO AN INWARD MOVEMENT OF THE DIAPHRAGM RESULTING FROM THE ACT OF INHALING BY A USER AND MEANS FOR SECURING THE MASK TO A USER.