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| All Patents in class 173/59 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,590,353 | Jun. 29, 1926 | G.H. Ekstrom | Rubbing machine | handheld power sanders | |
| 6,000,888 | Dec. 14, 1999 | R.L. Hartman | Quick Coupler Mechanism for Power Tool Bits | ||