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Priority to JP4941074ApriorityCriticalpatent/JPS54779B2/ja
Publication of JPS50142256ApublicationCriticalpatent/JPS50142256A/ja
Publication of JPS54779B2publicationCriticalpatent/JPS54779B2/ja
Improvements in or relating to apparatus for detecting, and indicating and/or recording the wear of overhead trolley wires for electrically driven vehicles
Improvements in or relating to apparatus for detecting, and indicating and/or recording the wear of overhead trolley wires for electrically driven vehicles