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| All Patents in class 254/322 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 715,991 | Dec. 16, 1902 | C.A. Baechtold, H.N. Covell | Derrick swinging and controlling device | ||
 | 1,806,433 | May 19, 1931 | G.E. Weaver, A.J. Vettel | Wreck crane | |