File:Wiedemann, Gustav Heinrich – Lehre von den Wirkungen des galvanischen Stromes in die Ferne, 1874 – BEIC 6746637.jpg
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![File:Wiedemann, Gustav Heinrich – Lehre von den Wirkungen des galvanischen Stromes in die Ferne, 1874 – BEIC 6746637.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/Wiedemann%2C_Gustav_Heinrich_%E2%80%93_Lehre_von_den_Wirkungen_des_galvanischen_Stromes_in_die_Ferne%2C_1874_%E2%80%93_BEIC_6746637.jpg/384px-Wiedemann%2C_Gustav_Heinrich_%E2%80%93_Lehre_von_den_Wirkungen_des_galvanischen_Stromes_in_die_Ferne%2C_1874_%E2%80%93_BEIC_6746637.jpg?20220330093002)
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