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| All Patents in class 277/622 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 590,730 | Sep. 28, 1897 | C. Frantz, C.E. Swingle | Barrel Tapping Wrench | |
| 2,042,229 | May 26, 1936 | R.E. Jones | Detachable Union | ||