Zeppo Marx - United States patent #3,426,747
There is an old expression: “Serious as a heart attack.” Clearly, cardiac health is not something that people joke around about. For that reason, it is more than a little ironic that a lifesaving invention for measuring the regularity of a heartbeat came from one of America’s most beloved comedy troupe members. But that’s exactly what Zeppo Marx, of the renowned Marx Brothers, created with his cardiac pulse rate monitor.