...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 6840738 | Feathering turbine apparatus A feathering fluid-driven turbine comprises impellers, arranged around the turbine axis and affixed to axles disposed parallel to the axis of rotation of the turbine, and further comprises a vane, such as a wind vane, which points in the current direction of fluid f... | 01/11/2005 |
| 5993157 | Cycloidal propeller having wings operated by hydraulic clutches A cycloidal propeller to achieve strictly a rudder operation includes accessory apparatuses containing accessory drives. Clutches are used to couple the accessory drives to the propeller shafts, and additional clutches are provided to disengage the fixed ... | 11/30/1999 |
| 5188512 | Helicopter blade pitch control system A helicopter blade pitch control system allows blade pitch to be controlled with regard to the degree of rotational position of the blade with respect to the direction of travel and also the degree of pitch. The invention provides an improved arrangement ... | 02/23/1993 |
| 5174724 | Wind-electric water pumping system Disclosed is a two cylinder water well pumping system which uses the wind as a primary driving force with an alternate electric motor drive for use when the wind force is not adequate. The wind drives a square wheel turbine which in turn drives a swash pl... | 12/29/1992 |