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E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
E01C1/00—Design or layout of roads, e.g. for noise abatement, for gas absorption
E01C1/04—Road crossings on different levels; Interconnections between roads on different levels
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FR556516D1922-09-251922-09-25Installation de passerelles spéciales sur rues pour faciliter la circulation des voitures et piétons
ExpiredFR556516A
(fr)