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| Patents for Charles D. Wainwright | |||||
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| Number | Date | Patentee | Title | Type | |
| 390,899 | Oct. 09, 1888 | C.D. Wainwright, R.F. Pratt | Machine for Corrugating Wrought Metal Tubes | tube corrugating machines | |
| 434,060 | Aug. 12, 1890 | C.D. Wainwright, J.S. Hansen | Machine for Corrugating Tubes | tube corrugating machines | |