The Bell telegraph and telephone

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Date: 2006-10-30 22:35:43 Alexander Graham Bell National Geographic Society Scottish inventors Invention of the telephone Telephone Bell Acoustic telegraphy Telegraphy Elisha Gray Technology Telephony Electronic engineering		The Bell telegraph and telephone Add to Reading List Source URL: pandora.nla.gov.au Download Document from Source Website File Size: 110,89 KB Share Document on Facebook

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