Lowrey organ
From 1918-1940's, Frederick Lowrey experimented with electronic organ design. He tried different methods of tone generation. In the 1940s he fixed on the Eccles-Jordan circuit. This is a stable flip-flop oscillator. It became a Lowrey hallmark. The Lowrey organ relied on all-electronic tone generation. This was different to its main competitor, the Hammond organ.  Hammond used electromechanical  until 1975. Lowrey led Hammond in the development of automatic accompaniment features. In 1968, automatic rhythm was added. In 1970, the Genie model added automatic left hand and pedal. Lowrey originally targeted the home entertainment market. Lowrey also produced theatre organs and a full 2-manual with pedal church organ.