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| All Patents in class 414/718 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,396,860 | Aug. 13, 1968 | W.J. Witwer, J.V. Wright | Excavator and grader or crane apparatus | excavators | |
| 3,426,926 | Feb. 11, 1969 | W.J. Witwer | Hydraulic system for use with telescopic boom apparatus | ||