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Individual
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Individual
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Priority to ES128441ApriorityCriticalpatent/ES128441A3/es
Publication of ES128441A3publicationCriticalpatent/ES128441A3/es
Procédé, méthode et emploi de pompes à clapets-vannes-obturateurs, commandés, pour remblayage économique de galeries, chantiers, puits de mines, souterrains, tunnels, etc.