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Priority claimed from US356893Aexternal-prioritypatent/US3880603A/en
Priority claimed from AT618176Aexternal-prioritypatent/AT345494B/de
Application filed by Whetstone Clayton NfiledCriticalWhetstone Clayton N
Publication of ATA632676ApublicationCriticalpatent/ATA632676A/de
Application grantedgrantedCritical
Publication of AT356404BpublicationCriticalpatent/AT356404B/de