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Bergbau. --- Steinkohle. --- Steinkohlenbergbau. --- Ruhrgebiet.

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Arbeitsbeziehungen. --- Charbon --- Charbon --- Coal mines and mining --- Coal mines and mining. --- Coal trade --- Coal trade. --- Industrial relations --- Industrial relations --- Industrial relations. --- Kohlenbergbau. --- Mijnbouw. --- Mineral industries --- Mineral industries. --- Mines --- Relations industrielles --- Relations industrielles --- Steinkohlenbergbau. --- Unternehmensverfassung. --- Industrie --- Mines et extraction --- Industrie --- Essen . --- Germany --- Germany --- Ruhrgebiet. --- Ruhrgebiet.