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| Patents for E. R. Walker | |||||
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| Number | Date | Patentee | Title | Type | |
| 800,814 | Oct. 03, 1905 | R.H. Martens | Wrench | wrench combination tools | |
| 1,273,724 | Jul. 23, 1918 | J.D. Boughner | Drill Rod Connection | ||