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Individual
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Individual
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Priority to DE1937K0147157priorityCriticalpatent/DE690867C/de
Application grantedgrantedCritical
Publication of DE690867CpublicationCriticalpatent/DE690867C/de
Loseblaetterbuch, insbesondere Sichtkartei, mit geteiltem festem Buchruecken zum Zusammenarbeiten mit einer Durchschreibeeinrichtung mit gegen den Tisch waage-recht abgestuetzter Unterlagplatte