Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 5287934 | Soil working implement There is disclosed a plow constructed for displacement, by a traction vehicle, a predetermined direction. It comprises a cultivator having a generally U-shaped frame with a pair of lateral arms parallel to the above direction and interconnected by a bight... | 02/22/1994 |
| 5060586 | Disc blade scraper device The invention comprises an adjustable scraper device for scraping the disc blades of a grain drill. The device has a fixed mounting on the mounting for supporting the disc blades and a slidable mounting slidable along the fixed mounting to a selected adju... | 10/29/1991 |
| 4716971 | Tillage implement A tillage implement comprising a plurality of coulters or discs is provided with disc cleaning means to prevent the accumulation of dirt and debris between adjacent coulters or discs. The disc cleaning means can comprise a rotatable belt mounted between a... | 01/05/1988 |
| 4339004 | Soil compacting rollers A soil compacting roller comprises a cylinder rotatably mounted between the lower ends of substantially vertical limbs of two side supports. The cylinder is surrounded by a plurality of larger diameter rings which extend in relatively spaced apart, side-b... | 07/13/1982 |
