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| All Patents in class 318/281 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,316,997 | Apr. 20, 1943 | D.J. Smith | Tensioning means for chain saws | handheld chainsaws | |
| 2,643,357 | Jun. 23, 1953 | L.D. Clark | Instantly reversible motor | motor controls | |