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| All Patents in class 172/84 | |||||
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| Number | Date | Patentee | Title | Type | |
| 111,404 | Jan. 31, 1871 | I.P. Tice | Improvement in Digging-Machines | steam traction engines | |
| 1,655,044 | Jan. 03, 1928 | H.W. Bolens, G.T. Strite, C.J. Travers | Hoe arrangement | ||