Did You Know...
...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 |
| 4503902 | Heat exchanger for recovering waste heat Heat exchanger means for extracting heat from the flue gases of a warm air furnace is in the form of a tube wound spirally to define a first passageway wherein ambient air is heated by the flue gases passing through a second passageway between segments of... | 03/12/1985 |
