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Dex One Corporation was an American marketing company providing online, mobile and print search marketing via their DexKnows.com website, print yellow pages directories and pay-per-click ad networks in the U.S. In April 2013 Dex One merged with SuperMedia, and the combined company now does business as Dex Media. ==History== Dex One Corporation was founded as the R. H. Donnelley Company in 1886 by Reuben H. Donnelley, son of RR Donnelley founder Richard R. Donnelley, as The Chicago Directory Company. Donnelley primarily contracted with The Chicago Telephone Company to publish telephone directories for Chicago Telephone customers. In 1906, however, Donnelley would venture outside Chicago, contracting with Bell System firms such as New York Telephone, Wisconsin Telephone, and Cincinnati Suburban Telephone Co. In 1917, The Reuben H. Donnelley Company was incorporated and moved to New York City, retaining some offices in Chicago. In 1929, Donnelley died, leaving behind his company which continued to contract with the Bell System to publish telephone directories. In 1961, Dun & Bradstreet Corp merged with R.H. Donnelley becoming a wholly owned subsidiary. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DEX One」の詳細全文を読む スポンサード リンク
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