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| All Patents in class 74/329 | |||||
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| Number | Date | Patentee | Title | Type | |
| 755,504 | Mar. 22, 1904 | A.E. Robinson, C.F. Laur | Variable Speed Mechanism | ||
| 1,678,384 | Jul. 24, 1928 | B.P. Graves | Variable Speed Driving Mechanism | metalworking variable speed mechanisms | |