Professor of mining technology at the Helsinki University of Technology Kauko Järvinen and manager of the Otanmäki mine’s vanadium factory Martti Merenmies observing the mining site. Digitized original negative.
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Unknown author<span style="display: none;">Unknown author</span></div>
1957<div style="display: none;">date QS:P571,+1957-00-00T00:00:00Z/9</div>
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