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| Patents for W. H. Hartley | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,166,597 | Jan. 04, 1916 | H.L. Johnston | Grinding and refining mill | ||
| 1,264,128 | Apr. 23, 1918 | T.F. Rataiczak, H.L. Johnston | Mixing-machine | ||