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William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 6186243 | Cylinder mount for an agricultural frame A cylinder mounting arrangement for a folding implement includes reversible L-shaped plates supporting an auxiliary tube above a transverse tool supporting beam. The attaching location on the beam can be changed to avoid interference with the desired tool... | 02/13/2001 |
| 5743341 | Toolbar mounting structure providing tool adjustment in the hitch area Integral hitch and standard mounting structure for a toolbar includes a first embodiment having a hitch tube connected to a three point hitch and to a rear toolbar. Brackets located a substantial distance outwardly of the hitch connect the hitch tube to t... | 04/28/1998 |
| 4008770 | Scraper assembly for ground tillage implement discs This invention relates to an improved scraper assembly for the discs of ground tillage implements which is characterized by a mounting bracket fastenable onto the implement frame, an inverted generally L-shaped hanger subassembly carried by the mounting b... | 02/22/1977 |
| 3980141 | Moldboard plow A five, six, or seven bottom two-way reversible moldboard plow is made to be attached by a standard three-point hitch on a tractor and lifted by the hitch without the aid of a trailing wheel. This is accomplished by mounting the plow as far forward as pos... | 09/14/1976 |
