History of fluids coupling 🔧🛠✍🏻 The fluid coupling originates from the work of Dr.Hermen fottinger, who was the chief designer at the Vulcan works in Stettin. His patents from 1905 covered both fluid couplings and torque converters. In 1930 Harold Sinclair, working with the Daimler company devised a transmission system using a fluid coupling while riding on London buses during 1920. 1939 General Motors Corporation introduced Hydraulic drive, the first fully automatic automotive transmission s