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| Patents for E. M. Callaghan | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,036,601 | Aug. 27, 1912 | D.W. Frank, Sr. | Conbined Level, Plumb and Grade Finder | inclinometers | |
| 1,037,109 | Aug. 27, 1912 | W.L. Bessolo | Pipe Wrench | pipe wrenches | |
| 1,155,948 | Oct. 05, 1915 | L.W. Millsap, Jr. | MONKEYPLIERS Wrench | screw adjust wrenches | |
| 1,158,164 | Oct. 26, 1915 | W.L. Bessolo | Wrench | quick adjust wrenches | |
| 1,163,532 | Dec. 07, 1915 | T. Hand | Wrench | pliers type wrenches | |