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| Patents for John Merckens | |||||
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| Number | Date | Patentee | Title | Type | |
| 825,401 | Jul. 10, 1906 | J. Merckens | Wrench | alligator wrenches | |
| 828,859 | Aug. 14, 1906 | J. Merckens | Combined Wrench and Thread Retracing Tool | wrench combination tools | |