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Priority to JP5120873UpriorityCriticalpatent/JPS502361U/ja
Publication of JPS502361UpublicationCriticalpatent/JPS502361U/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