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Priority to JP6898476ApriorityCriticalpatent/JPS52152013A/ja
Publication of JPS52152013ApublicationCriticalpatent/JPS52152013A/ja
Publication of JPS5643892B2publicationCriticalpatent/JPS5643892B2/ja
JP6898476A1976-06-121976-06-12Method of and mechanism for selectively advancing backing vehicles by automatic direction control means
GrantedJPS52152013A
(en)