character: Guglielmo Marconi
topic: Development of Wireless Communication
grade: 9
subject: Science
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character: Nikola Tesla
topic: Contributions to Radio Technology
grade: 9
subject: Science
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character: Thomas Edison
topic: Inventions in Electrical Communication
grade: 9
subject: Science
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character: Alexander Graham Bell
topic: Telephone and Early Communication Devices
grade: 9
subject: Science
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