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Charles F. Kettering: Science of Automotive Engineering, 1936

First Assignment

In 1904, Kettering's first assignment at National Cash Register was to invent a motorized replacement for the hand lever the operator needed to pull for every cash register transaction. His solution was the addition of a small electric motor to the machine. The short, strong bursts of energy the register required were not possible with existing motors so Kettering devised a clutch arrangement to upgrade and exactly match the power needs of the wheel movements in the register.