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| Patents for Charles D. Butler | |||||
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| Number | Date | Patentee | Title | Type | |
| 671,177 | Apr. 02, 1901 | J.V. Beekman | Derrick-engine | hoists, winches, come-alongs | |
| 718,916 | Jan. 20, 1903 | H.N. Covell | Combined brake and friction operating mechanism | hoists, winches, come-alongs | |