English translation: fine granular lead wire / granular lead nanowire
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Explanation: Actually lead is not a ductile metal so one hardly comes across lead wires, but research is going on granular ead nanowires.
Ref.: The paper entitled "Investigation of superconducting properties of nanowires prepared by template synthesis"
Supercond. Sci. Technol. 16 (2003) 557–561