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Internationaler Kongress für Steinkohleaufbereitung (Essen)

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Kohlekeramikplakette "Internationaler Kongress für Steinkohlenaufbereitung"Kohlekeramikplakette "Internationaler Kongress für Steinkohlenaufbereitung"
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[Relation to person or institution] Internationaler Kongress für Steinkohleaufbereitung (Essen)
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