File:Joseph Bayer1843 Portrait von Johann Baptist Bayer.jpg
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![File:Joseph Bayer1843 Portrait von Johann Baptist Bayer.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/81/Joseph_Bayer1843_Portrait_von_Johann_Baptist_Bayer.jpg/505px-Joseph_Bayer1843_Portrait_von_Johann_Baptist_Bayer.jpg?20110405183322)
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