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