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| Patents for C. O. & A. D. Porter Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 411,055 | Sep. 17, 1889 | A.D. Porter, C.O. Porter | Saw-tooth swage | saw sharpening machines | |
| 882,122 | Mar. 17, 1908 | C.O. Porter, A.D. Porter | Cutter-guard for buzz-planers | jointers | |