61587100
9780953861316
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Mr Michael Robert Mumford is the author of 'Telephone History - Invention & Design: 1829 Dyar, 1839 Cooke & Wheatstone, 1843 Morse, to root servers on the World Wide Web, to Postel 1998. (First)', published 2018 under ISBN 9780953861316 and ISBN 0953861317.
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