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| All Patents in class 74/590 | |||||
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| Number | Date | Patentee | Title | Type | |
| 685,617 | Oct. 29, 1901 | A.A. Koch | Pump-rod balance | ||
| 1,608,720 | Nov. 30, 1926 | R.L. Carter | Counterbalance mechanism | handheld power tool accessories | |