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| Patents for Johann Hardt | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,411,493 | Apr. 04, 1922 | J. Hardt | Compass for Drawing Ellipses | compasses | |
| 1,431,654 | Oct. 10, 1922 | J. Hardt | Compasses For Drawing Oviform Curves | compasses | |