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| Patents for L. D. Heinrichs | |||||
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| Number | Date | Patentee | Title | Type | |
| 510,414 | Dec. 12, 1893 | N. Eccles | Wrench | quick adjust wrenches | |
| D27,542 | Aug. 17, 1897 | R. Whitaker | Horseshoe Calk | ||
| CA-62,580 | Feb. 07, 1899 | R. Ashworth, A.W. Ashworth | Wrench | pipe wrenches | |
| 627,466 | Jun. 27, 1899 | A.W. Ashworth, R. Ashworth | Wrench | wrench jaw components | |
| 628,218 | Jul. 04, 1899 | A.W. Ashworth, R. Ashworth | Wrench | pipe wrenches | |