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Priority to JP47002222ApriorityCriticalpatent/JPS519291B2/ja
Publication of JPS4873132ApublicationCriticalpatent/JPS4873132A/ja
Publication of JPS519291B2publicationCriticalpatent/JPS519291B2/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