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- Lithograph diagram of a motor patented by William J. Still in the United States 1894, after it was previously patented in Canada in 1893. Note Fetherstonhaugh's signature in the lower corner. U.S. Patent No. 517668.
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- https://torontoist.com/wp-content/uploads/2012/05/20120526motorpatent.jpg
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- https://torontoist.com/2012/05/historicist-the-dawn-of-the-horseless-era/20120526motorpatent/slide/20120526motorpatent/
- 20120526motorpatent
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