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ARMSTRONG COALBREAK Co
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ARMSTRONG COALBREAK Co
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Application filed by ARMSTRONG COALBREAK CofiledCriticalARMSTRONG COALBREAK Co
Application grantedgrantedCritical
Publication of FR1151457ApublicationCriticalpatent/FR1151457A/fr
E21C37/00—Other methods or devices for dislodging with or without loading
E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
E21C37/14—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by compressed air; by gas blast; by gasifying liquids
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Engineering & Computer Science
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General Life Sciences & Earth Sciences
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Geology
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FR1151457D1954-12-091954-12-09Perfectionnements aux dispositifs à pression de gaz
ExpiredFR1151457A
(fr)