Elisha Gray

in Cleveland Ohio to supply telegraph equipment to the giant Western Union Telegraph Company. After a few years of testing he was recognized as the inventor of the underwater signaling device. On Monday morning February 14 1876 Gray signed and had notarized the caveat that described a telephone that used a liquid microphone.

Gray is also considered to be the father of the modern music synthesizer and was granted over 70 patents for his inventions. Gray is best known for his development of a telephone prototype in 1876 in Highland Park Illinois and is considered by some to be the true inventor of the variable resistance telephone despite losing out to Alexander Graham Bell for the telephone patent.