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| Patents for George Marshall Clark | |||||
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| Number | Date | Patentee | Title | Type | |
| 369,163 | Aug. 30, 1887 | G.M. Clark | Disk-harrow | harrows | |
| 712,907 | Nov. 04, 1902 | G.M. Clark | Harrow | harrows | |
| 712,996 | Nov. 04, 1902 | G.M. Clark | Harrow | harrows | |