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Scanned from the book: Conrad
Matschoss: 50 Jahre Ingenieur-Arbeit in Oberschlesien Eine Gedenkschrift zur Feier des 50 jährigen Bestehens des Oberschlesischen Bezirksvereins deutscher Ingenieure, Berlin: Springer 1907, p. 191.
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Germany and possibly other countries, certain anonymous works published before July 1, 1995 are copyrighted until 70 years after the death of the author. See
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and those countries with a copyright term of 70 years after the work was made available to the public and the author never disclosed their identity.
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The ventilation fan for the mine, (diameter 8,6 m), made probably by
Donnersmarckhütte (later Huta Zabrze in Zabrze, Poland).
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http://www.digitalis.uni-koeln.de/Matschossi/matschossi55-65.pdf
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Commons is a freely licensed media file repository.
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