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E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
E21F5/20—Drawing-off or depositing dust
E—FIXED CONSTRUCTIONS
E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
E01H1/005—Mobile installations, particularly for upkeeping in situ road or railway furniture, for instance road barricades, traffic signs; Mobile installations particularly for upkeeping tunnel walls
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FR443749A1911-05-291912-05-13Perfectionnements aux moyens pour enlever la poussière dans les mines de houille et autres endroits
ExpiredFR443749A
(fr)