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| Patents for L. Houlds | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-41,676 | Jan. 17, 1893 | W. Bill | Combined Monkey Wrench and Pipe Wrench | pipe wrenches | |
| 491,513 | Feb. 14, 1893 | W. Bill | Combined Monkey-Wrench and Pipe Wrench | pipe wrenches | |