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| All Patents in class 408/194 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,056,670 | Mar. 18, 1913 | L.S. Hayden | Expansion Bit | drill bits | |
| 1,379,332 | May 24, 1921 | G.P. Butler | Expansion-bit | adjustable drill bits | |