Simplex
Simplex Netherlands
(Amsterdam) 1902 to 1968
Simplex by Patrick Engineering
(Birmingham) made from 1919 to 1922
Simplex Engine Co. Coventry-Simplex Engines
Simplex by Hobday
1906-1908 (UK)
Simplex
1921-1925 (Berlin)
Simplex (New Orleans, Louisiana) 1930s to the late 1960s, Servi-Cycle
Simplex (Mulhouse, France)
Simplex of Torino
(Italy) built by Luigi Pellini between 1921 and 1950 using OHV engines
Simplex,
Australian
, built from the 1930's using Villiers engines.
Symplex
UK