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Liquid Transmitter for Telephone
Elisha Gray invents a liquid transmitter for use with a telephone, but does not build one. https://en.wikipedia.org/wiki/Timeline_of_the_telephone -
Telephone Invension
Gray's patent caveat for the telephone to the Washington, D.C. Patent Office. Bell's lawyer brings patent office Bell's patent application for the telephone. Although his caveat was not a full application, Gray could have converted it into a patent application and contest Bell's priority, but did not do so because of advice from his lawyer.The result was that the patent was awarded to Bell.
https://en.wikipedia.org/wiki/Timeline_of_the_telephone -
Telephone granted to Bell
Bell's U.S. Patent, No. 174,465 for the telephone is granted. https://en.wikipedia.org/wiki/Timeline_of_the_telephone -
Bell's first success trandsmiting speech
Bell first successfully transmits speech, saying "Mr. Watson, come here! I want to see you!" using a liquid transmitter as described in Gray's caveat, and Bell's own electromagnetic receiver. https://en.wikipedia.org/wiki/Timeline_of_the_telephone -
Acoustic Telegrapy
Thomas Edison files first patent application for acoustic telegraphy for which U.S. patent 182,996 was granted October 10, 1876. https://en.wikipedia.org/wiki/Timeline_of_the_telephone -
Bell's first long distance call
Alexander Graham Bell makes the world's first long distance telephone call, about 6 miles between Brantford and Paris, Ontario, Canada. https://en.wikipedia.org/wiki/Timeline_of_the_telephone -
first two-way long distance call
Bell makes the first two-way long distance telephone call between Cambridge and Boston, Massachusetts. https://en.wikipedia.org/wiki/Timeline_of_the_telephone -
electromagnetic telephone
Bell's U.S. Patent No. 186,787 is granted for an electromagnetic telephone using permanent magnets, iron diaphragms, and a call bell. https://en.wikipedia.org/wiki/Timeline_of_the_telephone
