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| Patents for C. O. Porter Machinery Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 940,940 | Nov. 23, 1909 | C.O. Porter | Rotary cutter-head | cutterheads | |
| 2,183,258 | Dec. 12, 1939 | J.R. Harman | Power operated router | routing machines | |