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Thomas Edison obtained a patent for an electrographic vote recorder.
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| Number | Title | Issue Date |
| 5183119 | Anti-snag plowing system An anti-snag plowing system suitable for clearing mines in the Middle East is disclosed. Advantageously, the plowing system has also been found to be an efficient and effective soil conditioner, making it a useful farming tool as well. The plowing system ... | 02/02/1993 |
| 4723608 | Depth sensing skid assembly A depth sensing skid arrangement for an implement including a spring steel depth skid connected to a shank which in turn is pivotally connected to a shank support bracket including a spring trip arrangement which permits backing of the implement without d... | 02/09/1988 |
| 4601347 | Automatic reversible wheel track filler A direction of movement sensing apparatus is shiftably supported from the wheel track filling structure of a wheeled support tower for an irrigation pipe and is operative to shift between a first inoperative position assumed thereby when the tower is movi... | 07/22/1986 |
| 4596113 | Rake with pivotal tines A rake having independently pivotal tines which have eccentric portions designed so that the rake moves through the soil on edge upon displacement of the support in one direction and moves through the ground broadside upon displacement of the rake through... | 06/24/1986 |
| 4252198 | Ground levelling attachment for tractors A support member for stationary support from a tractor forward of a ground wheel thereof and an elongated front to rear extending mount has its front end supported from the support member for pivotal movement of the mount between a predetermined rearwardl... | 02/24/1981 |
| 3976145 | Finish tools with mounting bracket therefor An inverted U-shaped bracket is designed to flexibly mount transverse harrow tine supporting bars for independent movement of each other upon longitudinally extending implement carrier arms to permit drag angle adjustment and ability to back up without di... | 08/24/1976 |
