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| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| Poulsen, Valdemar |
(väl´d mär poul´sn) (KEY) , 1869–1942, Danish electrical engineer. He invented (1898) the telegraphone (an early wire recorder) and the high-frequency Poulsen arc used in wireless telegraphy and radio. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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