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When the prototypes of the ABC appeared in 1919 they featured some of the most advanced specifications of any motorcycle up to that date. Front and rear suspension, drum brakes, a 4-speed transmission, multi-plate clutch and tubular cradle frame to name a few. In many ways, the ABC was a forerunner of the BMW flat twin that appeared in 1923. Originally made in England by the Sopwith Aircraft Company, these machines were also made, under license, in France by aircraft makers Gnome et Rhone between 1920 and 1924.