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Zahnrad --- Toohed wheel

Detail eines Stahl-/Sauerstoff-Konverters nach dem OBM-Verfahren (Sauerstoffbodeneinblasung), verwendet von 1974 bis 1992

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Detail of a steel / oxygen converter according to the OBM method (oxygen floor injection), used from 1974 to 1992

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Uploaded on December 23, 2020