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| Patents for Charles E. Trowbridge | |||||
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| Number | Date | Patentee | Title | Type | |
| 127,121 | May 21, 1872 | C.E. Trowbridge | Improvement in Tools for Grooving the Rings of Spinning Frames | lathe tools | |
| 133,344 | Nov. 26, 1872 | C.E. Trowbridge | Machines for Manufacturing Rings for Spinning Machines | metal lathes | |