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| All Patents in class 74/3.5 | |||||
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| Number | Date | Patentee | Title | Type | |
| 310,969 | Jan. 20, 1885 | A. Williams | Drop-hammer lifter | drop hammers | |
| 3,392,591 | Jul. 16, 1968 | F.E. Erickson | On-off repeat cycle timer | machine tool controls | |