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michael-otto-foto: Walzenlader moderner Strebausbau
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michael-otto-foto: Walzenschrämlader
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michael-otto-foto: mining museum adit
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michael-otto-foto: mining museum
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michael-otto-foto: green light
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michael-otto-foto: mining museum
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michael-otto-foto: " Garderobe"
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michael-otto-foto: locked
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michael-otto-foto: flying book pages
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michael-otto-foto: dark closeup
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michael-otto-foto: dark room
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michael-otto-foto: no passage
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michael-otto-foto: be careful electricity
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michael-otto-foto: mining museum
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michael-otto-foto: Three at once