Poulsen, Valdemar (väl'dumär poul'sun) [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.
Read more: Valdemar Poulsen — Infoplease.com http://www.infoplease.com/ce6/people/A0839928.html#ixzz1AudHucIa
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