“The world’s first wireless telephone conversation occurred in 1880 , when Alexander Graham Bell and Charles Sumner Tainter invented and patented the photophone, a telephone that conducted audio conversations wirelessly over modulated light beams (which are narrow projections of electromagnetic waves).”
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1885 – Thomas Edison patented a system of wireless communication by electrostatic induction . 1886 – Heaviside introduced impedance as the ratio of voltage over current. Hertz started his work to demonstrate the existence of radio waves and published his results in 1888.22 Tem 2015
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