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<p>forward the argument that it used a differential gear.<br/>
* 1810: <a href="page.php?w=Rudolph_Ackermann">Rudolph Ackermann</a> of Germany invents a four-wheel steering system for carriages, which some later writers mistakenly report as a differential.<br/>
* 1823: <a href="page.php?w=Aza_Arnold">Aza Arnold</a> develops a differential drive train for use in <a href="page.php?w=Cotton-spinning_machinery">cotton-spinning</a>. The design quickly spreads across the United States and into the United Kingdom.<br/>
* 1827: Modern automotive differential</p><p>
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