"Zeppo Marx was a multi-millionaire due to his engineering efforts." #readingToday  

Offstage, Zeppo had great mechanical skills and was largely responsible for keeping the Marx family car running. He later owned a company which machined parts for the war effort during World War II, Marman Products Co. of Inglewood, California, later known as the Aeroquip Company. This company produced a motorcycle, called the Marman Twin[9] and the Marman clamps used to hold the "Fat Man" atomic bomb inside the B-29 bomber, Bockscar. He also founded a large theatrical agency with his brother Gummo, and invented a wristwatch that would monitor the pulse rate of cardiac patients and give off an alarm if the heartbeat became irregular.