1657 - 1724

Johannes Kropff was the first person with the name of Kropff to hold co-ownership in the company. It is possible to seamlessly name the owners of the Olsberger Hütte from the time he joined the company.

The Kropff family dominated the company's fortunes over several generations. But the Unkraut and Kannegießer families had also already become co-owners in the company during this period.

Johannes Kropff was succeeded by his son.