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| All Patents in class 172/656 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,441,717 | Jan. 09, 1923 | C.H. White | Tool Holder for Cultivators | agricultural tool holders | |
| 2,873,149 | Feb. 10, 1959 | E.C. Redetzke | Cultivator Tool Holder | cultivators and tillers | |