https://www.cyclingnews.com/news/is-ford-about-to-change-derailleurs-forever/
Is there a particular reason why new US patent illustrations look as though they were drawn in 1886?
My take is that they need to be precise enough to get the actual patent while leaving out as much info as possible so it's harder to copy
@chez_jay started
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https://www.cyclingnews.com/news/is-ford-about-to-change-derailleurs-forever/