An illustrated description of J. M. Roullot's change-speed gear for bicycles, in which different sized spur gears on the crank axle are made to engage with teeth on the interior of the sprocket wheel. (600 w.)
A change speed gear for bicycles
Rapport sur le Changement de Vitesse pour Bicyclette
1903
Aufsatz (Zeitschrift)
Französisch
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