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 |
| 4807664 | Programmable flow control valve unit A programmable flow control valve unit has a valve assembly with a solid state control cooperating with a programmable timing device to provide the operating mode for the purpose of operating the valve unit for a predetermined time period or periods in or... | 02/28/1989 |
| 4797820 | Programmable flow control valve unit with clock, program, automatic, manual, and repeat modes A programmable flow control valve unit has a valve assembly with a solid state control cooperating with a programmable timing device to provide the operating mode for the purpose of operating the valve unit for a predetermined time period or periods in or... | 01/10/1989 |
