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| All Patents in class 72/247 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,822,697 | Sep. 08, 1931 | P.R. Hahnemann | Sheet-metal working machine | beading machines | |
| 1,926,830 | Sep. 12, 1933 | A.T. Yates | Bending machine roll | ||