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Priority claimed from CH1802871Aexternal-prioritypatent/CH539236A/en
Application filed by Gerard Francis WittgensteinfiledCriticalGerard Francis Wittgenstein
Publication of ATA994372ApublicationCriticalpatent/ATA994372A/en
Application grantedgrantedCritical
Publication of AT329330BpublicationCriticalpatent/AT329330B/en