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Italy, Holland and England all had Simplex brands. The Dutch Simplex was made betwween 1902 and 1968. Early machines were fitted with Fafnir, MAG and Minerva engines, Motosacoche in the early twenties, and from the mid 1920s utilised both Blackburne and Bradshaw power units. In the late 1930s they also used Villiers (including a watercooled version) and Sachs twostrokes.. English Simplex machines were 105cc twostrokes for use on bicycles, and were made from 1919 to 1922. Italian Simplex motorcycles were built by Luigi Pellini between 1921 an 1950 using his own OHV engines of 149cc, 174cc, 210cc and 496cc, and after the war similar machines with 148cc and 248cc engines. There was also an American Simplex made from the late 1930s to the late 1960s, powered by small Bob McGrath of Australia writes: There may have also been an Australian made Simplex also. Assembled bike from the 1930's with a Villiers engine, and the usual makes of forks, wheels, gearbox ,etc. None are known to have survived.

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