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All Patents in class 81/37 | |||||
Number | Date | Patentee | Title | Type | |
1,837,943 | Dec. 22, 1931 | D.L. Blake | Multipurpose brace (long throw, short throw, angle brace.) | ||
2,815,834 | Dec. 10, 1957 | A.W. Mall | Portable power tool drive mechanism | impact wrenches |