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| Patents for H. Ehrhart | |||||
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| Number | Date | Patentee | Title | Type | |
| 21,826 | Oct. 19, 1858 | H. Ehrhart | Improved Paddle Wheel | ||
| 25,945 | Nov. 01, 1859 | W.H. Bitzer | Arrangement of devices in shingle-machines | shingle machines | |