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Publication of FR773291ApublicationCriticalpatent/FR773291A/fr
B42F17/00—Card-filing arrangements, e.g. card indexes or catalogues or filing cabinets
B42F17/30—Card-filing arrangements, e.g. card indexes or catalogues or filing cabinets modified for particular uses
FR773291D1933-05-151934-05-15Appareil pour la représentation d'événements historiques chronologiquement parallèles et consécutifs
ExpiredFR773291A
(fr)