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Westfaelische Berggewerkschaftskasse
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Westfaelische Berggewerkschaftskasse
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Application filed by Westfaelische BerggewerkschaftskassefiledCriticalWestfaelische Berggewerkschaftskasse
Application grantedgrantedCritical
Publication of FR991350ApublicationCriticalpatent/FR991350A/fr
E21C27/00—Machines which completely free the mineral from the seam
E21C27/02—Machines which completely free the mineral from the seam solely by slitting
E21C27/04—Machines which completely free the mineral from the seam solely by slitting by a single chain guided on a frame with or without auxiliary slitting means
Landscapes
Engineering & Computer Science
(AREA)
Mining & Mineral Resources
(AREA)
Mechanical Engineering
(AREA)
Life Sciences & Earth Sciences
(AREA)
General Life Sciences & Earth Sciences
(AREA)
Geochemistry & Mineralogy
(AREA)
Geology
(AREA)
FR991350D1949-07-251949-07-25Procédé et appareil pour l'abatage et l'évacuation du charbon
ExpiredFR991350A
(fr)