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| All Patents in class 414/694 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,476,274 | Nov. 04, 1969 | W.J. Witwer | Backhoe hydraulic control system | ||
| 3,589,539 | Jun. 29, 1971 | W.J. Witwer | Backhoe having an articulated gooseneck boom | ||