Elijah McCoy invented an oil-dripping cup for trains. Other inventors tried to copy McCoy's oil-dripping cup. But none of the other cups worked as well as his, so customers started asking for "the real McCoy." That's where the expression comes from.
John Hopps (Canadian), inventor of the first working external Pacemaker. It was made at the University of Toronto with the help of Dr. Wilfred Bigelow and Dr. John Callaghan in 1951.
Elijah McCoy, an African-American man, invented a device to keep train wheels oiled while the train was running. Others tried similar devices, but his was the best – and that’s the origination of the phrase The Real McCoy
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