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| All Patents of Type: cranes | |||||
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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 | |
| CA-822,521 | Sep. 09, 1969 | W.J. Witwer, J.V. Wright | Excavator and grader or crane apparatus | excavators | |
| 6,276,665 | Aug. 21, 2001 | F.H. Stewart, R.D. Brookshire, T.J. Hawkins, J.H. Blackburn, J.O. Hawkins | Mobile Floor Crane | cranes | |