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Alexander Graham Bell patented his first electric loudspeaker ( capable of reproducing intelligible speech ) as part of his telephone in 1876, which was followed in 1877 by an improved version from Ernst Siemens.
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Alexander and patented
The first crystal-controlled oscillator, using a crystal of Rochelle salt, was built in 1917 and patented in 1918 by Alexander M. Nicholson at Bell Telephone Laboratories, although his priority was disputed by Walter Guyton Cady.
This partitioning, an improvement over the continuous slab, was patented in 1924 by Arthur Wesley Hall and William Alexander McVay who wished to minimize damage to the concrete from the effects of tectonic and temperature fluctuations, both of which can crack longer segments.
An early experimental non-magnetic tape recorder patented in 1886 by Alexander Graham Bell's Volta Laboratory.
The earliest known audio tape recorder was a non-magnetic, non-electric version invented by Alexander Graham Bell's Volta Laboratory and patented in 1886 ().
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 ).
Alexander Graham Bell, who arrived from Scotland by way of Canada in 1872, developed and patented the telephone and related inventions.
* Three years after Alexander Graham Bell patented his telephone invention, Bennet Pell started a private telephone exchange in Singapore that had 50 lines.
The first of these conversions was patented on September 15, 1868 by Colt engineer, F. Alexander Thuer as patent number 82258.
* Alexander Twining-an American contemporary who patented a similar machine in 1850 and 1853.
* Powerbocking, the use of powered stilts patented by Alexander Böck
He invented the first telephone receiver with a permanent magnet in 1865, 11 years before Alexander Graham Bell patented his model.
A similar telephone system was patented in the United States by Alexander Graham Bell in 1876.
American professor Alexander C. Twining of Cleveland, Ohio patented an early vapor-compression refrigerator in 1853 that was fully capable of producing a ton of ice per day.
They were originally patented by Alexander Böck, from Germany ( European Patent EP 1 196 220 B1 on July 2, 2003, US Patent No. 6, 719, 671 B1 on April 13, 2004, both with a priority date of July 20, 1999 ), as Powerskip.
The Enigma machine dated back to 1919, when Hugo Alexander Koch, a Dutchman, patented an invention that he called a secret writing machine.
In 1991, Alexander Retuinskih patented Rossijskaya Otechestvennaya Systema Samozashchity or in acronym, R. O. S. S., " Russian Native System of Self-defense.
The process was patented by Alexander Parkes in 1850.
Barely two years after the telephone was first patented in the United States in 1876 by Alexander Graham Bell, an early concept of a combined videophone and wide-screen television called a telephonoscope was conceptualized in the popular periodicals of the day.
It was originally patented by Jacob Peyton and Alexander Shulgin in 1996 as an antidepressant.
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