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| Patents for John J. Hawkins | |||||
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| Number | Date | Patentee | Title | Type | |
| 273X | Feb. 12, 1800 | J.J. Hawkins | Improvement in piano fortes | music instrument maker | |
| 304X | Oct. 24, 1800 | J.J. Hawkins | Improvement in musical instruments | music instrument maker | |
| 453X | May 17, 1803 | J.J. Hawkins | Pentegraph and parallel ruler | parallel rules | |