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| All Patents in class 72/311 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 55,209 | May 29, 1866 | E. Paye | Machine for Turning Boiler Flanges | ||
| 3,234,773 | Feb. 15, 1966 | C.J. Bath | Gripping Head With Hold Back for Equalized Jaw Advancement | ||