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| Patents for Hiram Twiss | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,194X | May 13, 1834 | H. Twiss | Clocks and time-pieces | clockmaker | |
| 8,195X | May 13, 1834 | H. Twiss | Pendulum, balance | clockmaker | |
| 243 | Jun. 19, 1837 | H. Twiss | Mill for grinding coffee and other substances | coffee mills | |