French Patent # 738,147 - Idéal

French Patent 738,147 - Ideal main image

In 1932 Claudius Jacquemard applied for this patent for what appears to be a lightweight racing derailleur designed to work with a close ratio 3 speed freewheel. It is striking that, during the 1930s, racing was seen as requiring very simple, not to say, crude, designs, with all complexity and sophistication reserved for touring models.

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