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A Wednesday, Dec. 18, 2013 photo shows the second imaging chamber, which was one of the first of the heartbeat simulators that were built by machinist Juan Fernandez (this one was made with plastic screws and was compatable with MRI machines) at Methodist, in Houston. Fernandez's handiwork has made some very significant contributions to in the history of cardiovascular surgery. He works on designing all kinds of instruments for the doctors and researchers at hospitals whether they be complex prototypes for medical devices or trying to remake simple surgical tools that have been discontinued.   (AP Photo/ Houston Chronicle, Karen Warren)

A Wednesday, Dec. 18, 2013 photo shows the second imaging chamber, which was one of the first of the heartbeat simulators that were built by machinist Juan Fernandez (this one was made with plastic screws and was compatable with MRI machines) at Methodist, in Houston. Fernandez's handiwork has made some very significant contributions to in the history of cardiovascular surgery. He works on designing all kinds of instruments for the doctors and researchers at hospitals whether they be complex prototypes for medical devices or trying to remake simple surgical tools that have been discontinued. (AP Photo/ Houston Chronicle, Karen Warren)

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