A) Mention the main invention or the innovative idea that has been contributed by Alexander Graham Bell? B) In your own words, explain how this idea is useful for mankind (Give examples)?

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A) Mention the main invention or the
innovative idea that has been contributed
by Alexander Graham Bell?
B) In your own words, explain how this
idea is useful for mankind (Give
examples)?
Transcribed Image Text:A) Mention the main invention or the innovative idea that has been contributed by Alexander Graham Bell? B) In your own words, explain how this idea is useful for mankind (Give examples)?
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