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http://www.google.com/patents/US1647?utm_source=gb-gplus-share
Patent US1647 - IMPROVEMENT IN THE MODE OF COMMUNICATING INFORMATION BY SIGNALS BY THE
IMPROVEMENT IN THE MODE OF COMMUNICATING INFORMATION BY SIGNALS BY THE
SAMUEL F. B. MOESB
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› Abstract
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Patent number
: 1647
Issue date
: Jun 20, 1840
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