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| All Patents in class 318/548 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,893,448 | Jul. 07, 1959 | B.C. Elworthy | Safety system for sawmill carriages | sawmill carriages | |
| RE25,104 | Dec. 26, 1961 | B.C. Elworthy | Safety system for sawmill carriages | sawmill carriages | |