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| Patents for W. P. Callahan & Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 579,789 | Mar. 30, 1897 | P.T. Coffield | Gas Engine | internal combustion engine governors | |
| 731,001 | Jun. 16, 1903 | E.E. Williams | Explosion Engine | carburetors | |