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There ended up a lot of modest telegraph delivery organizations in the United States in the 19th century. In 1874, 57 district telegraph delivery companies affiliated and grew to become "American District Telegraph". With the boost in phone use in the late 19th century, adt security systems business little by little declined in popularity. ADT experimented with branching out and establishing their signaling business whilst even now maintaining their telegraph company as major cash flow source. ADT incorporated into Western Union in 1901. ADT separated its messenger enterprise from its major signaling enterprise at this time. In 1909, Western Union and ADT came under the management of AT&T. home security system began to grow into new areas this sort of as fire alarms and burglar alarms in between 1910 and 1930, but was stored separate from AT&T's Holmes alarm business. adt grew to become a publicly owned business in the 1960s.

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