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