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| All Patents in class 408/228 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,227,514 | May 22, 1917 | T.B. Williams, F.L. Smith | Rotary cutter | automotive tools | |
| 1,285,350 | Nov. 19, 1918 | C.A. Palmgren | Tool | drill bits | |
| 4,720,219 | Jan. 19, 1988 | F.N. Rabo, S.J. Masonek | Reboring Tool | ||