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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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FR377291D1907-04-301907-04-30Dispositif pour détacher les blocs de houille et de roche dégagés sur plus de deux faces ou sapés par en dessous
ExpiredFR377291A
(fr)
Dispositif pour recueillir et récupérer les poussières de charbon provenant des tunnels de déchargement, des appareils de tamisage ou autres appareils analogues