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| | American District Telegraph Company ( Now Tyco International) |
 | | Celebrating its 129th anniversary, ADT Security Services, Inc., a unit of Tyco Fire & Security, is the largest single provider of electronic security services to more than five million commercial, government and residential customers throughout the United States. |
 | | In 1901, ADT was incorporated as a subsidiary of Western Union. |
 | | In 1987, ADT was purchased by the Hawley Group, Ltd., and renamed ADT Security Systems, Inc. The U.S. headquarters were relocated from New York City to Parsippany, N.J. In early 1998, ADT, Ltd. was acquired by Tyco International Ltd. Today, ADT has residential and commercial coverage in about 230 major U.S. markets. |
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