character: Alexander Graham Bell
topic: Invention of the Telephone
grade: 10
subject: Physics
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character: Telephone
topic: Impact on Communication Technology
grade: 10
subject: Physics
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character: Telecommunication Industry
topic: Evolution After the Telephone
grade: 10
subject: Physics
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character: Modern Telecommunication
topic: Influence of Bell's Invention
grade: 10
subject: Physics
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