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Within the timeline of radio, several people were involved in the invention of radio and there were many key inventions in what became the modern systems of wireless.[1] Radio development began as "wireless telegraphy".[1] Closely related, radio was developed along with two other key inventions, the telegraph and the telephone.[1] During the early development of wireless technology and long after its wide use, disputes persisted as to who could claim credit for the invention of radio. The matter was important for economic, political and nationalistic reasons. Several different electrical, magnetic, or electromagnetic physical phenomena can be adapted to transmission of signals over a distance without intervening wires. The various methods for wireless signal transmissions include All these physical phenomena have been tested for purposes of communication. Early researchers may not even have understood or disclosed which physical effects were responsible for transmitting signals. Early experiments used the existing theories of the movement of charged particles through an electrical conductor. There was no theory of electromagnetic wave propagation to guide experiments before Maxwell's treatise and verification by Hertz and others. Capacitive and inductive coupling systems today are used only for short-range special purpose systems. The physical phenomenon most widely used today for long-distance communications involves the theory of modulation of electromagnetic waves, which is radio.
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