Valdemar Poulsen
Valdemar Poulsen (23 November 1869 – 6 August 1942) was a Danish engineer who developed a magnetic wire recorder called the telegraphone in 1898. He also made significant contributions to early radio technology, including the first continuous wave radio transmitter, the Poulsen arc, which was used for a majority of the earliest audio radio transmissions, before being supplanted by the development of vacuum-tube transmitters. Provided by Wikipedia-
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6Contribution to the lower and middle Cambrian paleontology and stratigraphy of Northwest Greenland /by Poulsen, Valdemar
Published 1964
Thesis Book -
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12by Poulsen, Valdemar
Published 1965
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15by Poulsen, Valdemar, 1869-1942
Published 1906
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