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| Patents for Robert Erdman | |||||
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| Number | Date | Patentee | Title | Type | |
| 276,793 | May 01, 1883 | W. Phillips, R. Erdman | Combination Pliers, Hammer, Screwdriver, etc. | combination tools | |
| CA-17,335 | Jul. 21, 1883 | R. Erdman | Improvements In Combination Tools | combination tools | |