File:Christian Adolph Jespersen by Ohm.jpg
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![File:Christian Adolph Jespersen by Ohm.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Christian_Adolph_Jespersen_by_Ohm.jpg/380px-Christian_Adolph_Jespersen_by_Ohm.jpg?20121025201444)
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