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| Patents for J. A. Callahan | |||||
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| Number | Date | Patentee | Title | Type | |
| 292,130 | Jan. 15, 1884 | J.P. Herron, E. Morrison | Machine for Testing Fabrics | textile machines | |
| 292,131 | Jan. 15, 1884 | J.P. Herron, E. Morrison | Thickness Gage | thickness gages | |