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Acoustic and electronic stethoscope

  • US 3,247,324 A
  • Filed: 06/26/1964
  • Issued: 04/19/1966
  • Est. Priority Date: 06/26/1964
  • Status: Expired due to Term
First Claim
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1. A STETHOSCOPE COMPRISING IN COMBINATION, AN ACOUSTICAL SOUND PICK-UP HEAD MEANS, A FIRST ACOUSTICAL CHAMBER, AN ELONGATED CONDUIT MEANS HAVING AN AIR COLUMN OF APPRECIABLE LENGTH AS COMPARED WITH ITS CROSSSECTIONAL AREA CONNECTING SAID SOUND PICK-UP HEAD MEANS AND SAID FIRST ACOUSTICAL CHAMBER, A SECOND ACOUSTICAL CHAMBER, SOUND DUCT AND VALVE MEANS INTERCONNECTING THE TWO ACOUSTICAL CHAMBERS, SAID VALVE MEANS IN ONE POSITION INTERRUPTING THE SOUND COMMUNICATION BETWEEN THE FIRST AND SECOND CHAMBERS, A MICROPHONE IN SAID FIRST ACOUSTICAL CHAMBER, A SOUND REPRODUCER IN SAID SECOND ACOUSTICAL CHAMBER, AN AMPLIFIER NETWORK INTERCONNECTING THE MICROPHONE AND THE SOUND REPRODUCER, SAID AMPLIFIER MEANS HAVING A CONTROL MEANS, MEAN CONNECTING THE CONTROL MEANS AND SAID VALVE MEANS WHEREBY WHEN SAID AMPLIFIER IS ACTIVATED SAID VALVE MEANS INTERRUPTS THE

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