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| All Patents in class 403/385 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,863,970 | Jun. 21, 1932 | F.V. Donald | Adjustable connector | ||
| 2,873,149 | Feb. 10, 1959 | E.C. Redetzke | Cultivator Tool Holder | cultivators and tillers | |