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probably edison's first invention was an automatic telegraph repeater (circa 1864). his first patent was for an electric vote recorder. ın 1869, as a partner in a new york electrical firm, he perfected the stock ticker and sold it. this money, in addition to that from his share of the partnership, provided funds for his own factory in newark, n.j. edison hired technicians to collaborate on inventions; he wanted an "invention factory." as many as 80 "earnest men," including chemists, physicists, and mathematicians, were on his staff. "ınvention to order" became very profitable.
from 1870 to 1875, edison invented many telegraphic improvements: transmitters; receivers; the duplex, quadruplex, and sextuplex systems; and automatic printers and tape. he worked with christopher sholes, "father of the typewriter," in 1871 to improve the typing machine. edison claimed he made 12 typewriters at newark about 1870. the remington company bought his interests.
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