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Period: to
To the first loudspeaker
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Johann Philipp Reis - Electric Loudspeaker developed
Loudspeaker was added to the world's first telephone, called the Reis telephone. -
Alexander Graham Bell - Improved loudspeaker
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Improved on by Ernst Siemens - German patent gotten
German inventor and industrialist. Founder of Siemens telecommunications company.
The patent received was for an 'electromechanical "dynamic" or moving-coil transducer". -
Oliver Lodge - Moving Coil (Dynamic) Driver Speakers
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Peter L. Jensen, Edwin Pridham - First Practical application of Dynamic Driver Speakers
Moving-coil loudspeaker -
Dynamic Driver Speakers patented by Chester W. Rice, Edward W. Kellogg
First prototype in 1921. Patent filed April 1st, 1925.
