Which was the first important invention of Thomas Alva Edison?
a) Telegraphic repeating instrument
b) Phonograph
c) Kinetoscope
d) Storage Battery
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b. phonograph........
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Answer:
phonograph
Edison began his career as an inventor in Newark, New Jersey, with the automatic repeater and his other improved telegraphic devices, but the invention that first gained him wider notice was the phonograph in 1877.
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