Recoures
1) http://www.instabriefs.com/medical-devices/stethoscopes/stethoscopes-fast-facts.php
2) http://www.instabriefs.com/medical-devices/stethoscopes/stethoscopes-fast-facts.php
3) http://www.standris.com/education_history.cfm 4) http://www.whyzz.com/how-does-a-stethoscope-work
5) http://www.aids.academickids.com/encyclopedia/index.php/Stethoscope
6) http://www.healthgnome.blogspot.com/2012/03/history-of-stethoscope.html
7) http://www.blurtit.com/q452932.html
8) http://www.ehow.com/facts_7172993_stethoscope-made-of_.html
9) http://www.madehow.com/volume-1/stethoscope.html#b
10) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1570491/
2) http://www.instabriefs.com/medical-devices/stethoscopes/stethoscopes-fast-facts.php
3) http://www.standris.com/education_history.cfm 4) http://www.whyzz.com/how-does-a-stethoscope-work
5) http://www.aids.academickids.com/encyclopedia/index.php/Stethoscope
6) http://www.healthgnome.blogspot.com/2012/03/history-of-stethoscope.html
7) http://www.blurtit.com/q452932.html
8) http://www.ehow.com/facts_7172993_stethoscope-made-of_.html
9) http://www.madehow.com/volume-1/stethoscope.html#b
10) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1570491/