31344618
9781245555135
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Langdon-Davies, C. is the author of 'Explication du Phonopore, Se Rapportant Plus Sp�cialement Au T�l�graphe Phonopore Simplex an Explanation of the Phonopore, and More Especially Th', published 2011 under ISBN 9781245555135 and ISBN 1245555138.
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