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| Patents for Robert Campbell | |||||
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| Picture | Number | Date | Patentee | Title | |
| 215,717 | May 27, 1879 | R. Campbell | Rotary Engine | ||
 | 867,556 | Oct. 01, 1907 | R. Campbell | Combination Tool | |
| 1,061,045 | May 06, 1913 | R. Campbell | Rule Attachment | ||