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1667: Robert Hooke creates an acoustic string telephone that conveys sounds over a taut extended wire by mechanical vibrations
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1861: Johann Philipp Reis transfers voice electrically over a distance of 340 feet with his Reis telephone. To prove that speech can be recognized successfully at the receiving end, he uses the phrase "The horse does not eat cucumber salad" as an example because this phrase is hard to understand acoustically in German
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July 1873: Thomas Edison notes varying resistance in carbon grains due to pressure, and builds a rheostat based on the principle but abandons it because of its sensitivity to vibration.
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July 1874: Alexander Graham Bell conceives the theoretical concept for the telephone while vacationing at his parents' farm near Brantford, Canada. Alexander Melville Bell records notes of his son's conversation in his personal journal.
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4 May 1875: Bell conceives of using varying resistance in a wire conducting electric current to create a varying current amplitude.[4]
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1879: Francis Blake invents a carbon transmitter similar to Edison's that saves the Bell company from extinction.
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20 March 1880: National Bell Telephone merges with others to form the American Bell Telephone Company.
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3 May 1892: Thomas Edison awarded patents for the carbon microphone based on applications lodged in 1877.
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Phil Porter, a Bell Labs engineer, proposed that cell towers be at the corners of the hexagons rather than the centers and have directional antennas pointing in 3 directions.
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2005: Mink, Louisiana finally receives traditional landline telephone service (one of the last in the United States)
[https://en.wikipedia.org/wiki/Timeline_of_the_telephone]
