Invention Room details
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Dynamic Accentor
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1-Aug-1956 article on Dynamic Accentor
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1912 Hammond was a US Delegate to the Int'l Telegraphic Conf in London
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Alexander Graham Bell and John Hays Hammond Jr.
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Castle lobby area was lab and business office
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Dr. Hammond at his office desk
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Hammond on the stairs in the Great Hall
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Hammond watching his pipe organ being manufactured
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