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1920s French automobile
Not to be confused with Syntax.
The Santax was a French automobile manufactured by Cyclecars Le Santax of Paris from 1920 until 1927. It was a small cyclecar built with Anzani single-cylinder engines of 125 cc and got its name from being free of tax due to its small engine.
A larger 500 cc model followed in 1926.
References
David Burgess Wise, The New Illustrated Encyclopedia of Automobiles.