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ADT Security Services, originally American District Telegraph now also known as simply ADT, is a division Tyco International and a worldwide supplier electronic security systems, fire alarm systems, communication systems, and integrated building management systems.
In the United States in the 19th century, there were many small telegram delivery companies; in 1874, 57 district telegraph delivery companies affiliated and became "American District Telegraph". With the increase in telephone usage in the late 1800s, ADT's messenger business slowly declined in popularity. ADT tried branching out and developing their signaling business while still maintaining their telegraph business as primary income source. ADT incorporated into Western Union in 1901. ADT separated its messenger business from its main signaling business at this time. In 1909, Western Union and ADT came under the control AT&T. ADT began to expand into new areas like fire alarms and burglar alarms between 1910 and 1930, but was kept separate from AT&T's Holmes alarm business. ADT became a publicly owned company in the 1960s.