File:Hipp's clock, Otto's Encyclopedia.jpg
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![File:Hipp's clock, Otto's Encyclopedia.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Hipp%27s_clock%2C_Otto%27s_Encyclopedia.jpg/349px-Hipp%27s_clock%2C_Otto%27s_Encyclopedia.jpg?20140714225007)
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