1970 Press Photo Dr. Edward Diethrich with machine to keep hearts alive

Dr. Edward Diethrich, right, shows a colleague the device he uses to keep human hearts beating after they have been removed from a body. He has kept hearts "alive" for almost 44 hours and says "We would have transplanted them if we had the right recipient."

Photo is dated 1970.

Photo measures 8 x 10.25 inches.