The control and signaling equipment consists of three components, the ringer, the hookswitch, and a dial.The plastic separates that coating from another metal electrode and maintains an electric field between them.Citation needed Before the development of the electric telephone, the term " telephone " was applied to other inventions, and not all early researchers of the electrical device called it " telephone ".

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The traditional mechanical ringer was introduced with the early Bell telephones.Users who wanted the ability to speak to several different locations would need to obtain and set up three or four pairs of telephones.

Until the 1960s dials used almost exclusively the rotary technology, which was replaced by dual-tone multi-frequency signaling (dtmf) with pushbutton telephones (A4).28 December 1871: Antonio Meucci files patent caveat.Further tests and refinement of equipment followed shortly afterward.