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F W MOLL SOHNE
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F W MOLL SOHNE
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Publication of FR535761ApublicationCriticalpatent/FR535761A/fr
E21C41/00—Methods of underground or surface mining; Layouts therefor
E21C41/16—Methods of underground mining; Layouts therefor
E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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Mining & Mineral Resources
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FR535761D1915-08-061921-03-31Procédé pour l'exploitation de veines de charbon à gisement escarpé, avec remblayage des espaces exploités
ExpiredFR535761A
(fr)