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| All Patents in class 474/68 | |||||
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| Number | Date | Patentee | Title | Type | |
| 320,544 | Jun. 23, 1885 | W.H. Dodge | Device for transmitting power | belts, belt lacing and belt lacers | |
| 941,506 | Nov. 30, 1909 | C.B. Elmore | Change Speed Mechanism | metalworking speed changing mechanisms | |