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| Patents for John Callen | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,792 | Oct. 03, 1846 | J. Brooks, W. Sedgwick | Fruit, instrument for gathering | fruit pickers | |
| 160,904 | Mar. 16, 1875 | G.S. Hastings | Improvement in Measuring Rules | folding rules | |