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Functionality and Sound Quality

Functionality and Sound Quality
Hello All, Last week we meet up some two promising sound technicians, Doug and Jon, to see if they can help up to improve the functionality and sou...

ECHO Stethoscope Journey

  Hello fellow peers, My name is Mark V. Gross and I am the inventor of the ECHO Stethoscope, the world's first retractable stethoscope.  First, I ...