File:Heilman locomotive, Scientific American, 1897, vol. 77, no.10-006.jpg
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![File:Heilman locomotive, Scientific American, 1897, vol. 77, no.10-006.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/49/Heilman_locomotive%2C_Scientific_American%2C_1897%2C_vol._77%2C_no.10-006.jpg/800px-Heilman_locomotive%2C_Scientific_American%2C_1897%2C_vol._77%2C_no.10-006.jpg?20121014173111)
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