Telegraphy
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Colligan and Linley 2011 -- Ivan Raykoff chapter on piano interface in early telegraphs, typewriters, and player pianos
Kieve 1973 -- British history of the telegraph
see Arthur C. Clarke, How the World was One (1992)
see Gabler, The American Telegrapher (1988)
see Prescott, History Theory and Practice of the Electric Telegraph (1860)