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Perfectionnements apportes aux ensembles constitues par une feuille en matiere plastique et par au moins une bande de fermeture, egalement en matiere plastique
Válvula para envases de saquerío. Con prioridad de la solicitud de patente italiana núm 4319/61 y como desglose y transformación de las patentes españolas números 275421 y 279011 respectivamente