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"Poulsen Valdimar. Photo. No. 6." "Close up of arc." Caption by Douglas Perham, part of a series of pictures of "the first amateur station in the world, by Einar Dessau, in Copenhagen, Denmark, in 1907."
Federal Telegraph Company Poulsen arc transmitter Amateur radio stations--History (LCSH) Radio--Transmitters and transmission (LCSH) Dessau, Einar Poulsen, Valdemar