File:Robert Franz Arnold (1872–1938).jpg
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![File:Robert Franz Arnold (1872–1938).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Robert_Franz_Arnold_%281872%E2%80%931938%29.jpg/429px-Robert_Franz_Arnold_%281872%E2%80%931938%29.jpg?20170619222509)
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