Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| D640734 | Ergo calculator | 06/28/2011 |
| D633134 | Calculator lid | 02/22/2011 |
| D538327 | Bridge calculator | 03/13/2007 |
| D513035 | Calculator | 12/20/2005 |
| D509238 | Electronic calculator | 09/06/2005 |
| D508520 | Electronic calculator | 08/16/2005 |
| D501871 | Body mass index calculator | 02/15/2005 |
| D493190 | Body mass index calculator | 07/20/2004 |
| 4939514 | Foldable data collecting and processing device A foldable data collecting device includes a first case and a second case mutually connected in a foldable manner, and a plate hinged between the first case and the second case by an opening/closing support. A sheet-like keyboard is disposed on the surfac... | 07/03/1990 |
| 4916441 | Portable handheld terminal A handheld pocket terminal (22) having a display screen (40) and a bar code reader (42).... | 04/10/1990 |
| 4662518 | Lotta luck lottery kit The invention is designed to use with lottery tickets. It includes a container to hold at least ten lottery tickets. The container houses a scraper designed to remove the coating from the tickets, a protective lip which covers the "void if removed" sectio... | 05/05/1987 |
| 4323979 | Cartridge and bezel assembly for a calculator An electronic calculator utilizing a programmable read-only memory (PROM) cartridge for control of a number of the calculator functions is provided with a bezel which is snap-fit into a keyed opening in the calculator housing and guides a connector on the... | 04/06/1982 |
