On February 11, 1969, A.S. Hermann and Herbert “Zeppo” Marx — yes that “Zeppo” were issued U.S. Patent No.  3,426,727 on a Method and Watch Mechanism for Actuation by a Cardiac Pulse:

Who knew that Zeppo was the smartest of the Marx Brothers?  Or that he invented a Fit Bit, long before anyone else?