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| Patents for Robert Karcher | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,100,760 | Jun. 23, 1914 | S. Morelli | Pipe Cutting Tool | pipe cutting machines | |
| 1,184,947 | May 30, 1916 | J.A. Gossett, J.C. Hewitt | Pipe-forming machine | pipe making machines | |