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E21C37/00—Other methods or devices for dislodging with or without loading
E21C37/04—Other methods or devices for dislodging with or without loading by devices with parts pressed mechanically against the wall of a borehole or a slit
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FR326827D1902-11-291902-11-29Procédé et appareils pour l'enfoncement des coins de dérochement
ExpiredFR326827A
(fr)