The Ochydactyl, a finger exerciser, according to advertisements, could improve the agility, flexibility, strength and independence of any pianist's, violinist's, cellist's or typist's fingers. L'assouplisseur Ochydactyl (The Finger Softener) was invented by Frenchman Georges Rétif in 1922. It was produced in  in Sancoins, France. The design of the machine changes throughout its production but its basic mechanical principle remained the same.

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