character: Elisha Gray
topic: Competition in Telephone Technology
grade: 9
subject: Physics
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character: Alexander Graham Bell
topic: Telephone Invention and Patent Controversy
grade: 9
subject: Physics
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character: Thomas Edison
topic: Influence on Electrical Communication
grade: 9
subject: Physics
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character: Graham Bell and Elisha Gray
topic: Historic Patent Race in Telecommunications
grade: 9
subject: Physics
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