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Jeffrey Manufacturing Co
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Jeffrey Manufacturing Co
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Application filed by Jeffrey Manufacturing CofiledCriticalJeffrey Manufacturing Co
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Publication of FR594909ApublicationCriticalpatent/FR594909A/fr
E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
E21C35/06—Equipment for positioning the whole machine in relation to its sub-structure
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Mining & Mineral Resources
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General Life Sciences & Earth Sciences
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Geochemistry & Mineralogy
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FR594909D1924-04-071925-03-10Perfectionnement aux machines pour l'extraction du charbon
ExpiredFR594909A
(fr)