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/Components_of_the_electromechanical_telegraph_network._Proce_Wellcome_V0025510-a39ea4c848c64c6e875cbde229f658e2.jpg "The History of the Electric Telegraph and Telegraphy")
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EARLY BATTERIES: THE VOLTAIC CELL, THE 'GRAVITY' or CROW'S FOOT BATTERY and OTHER TELEGRAPH BATTERIES - TELEGRAPH & SCI INSTRUMENT MUSEUMS
