Suitable electronically conductive materials include {HEAD ~ graphite}, {TAIL ~ carbon}, nickel powder, nickel plated steel, and other materials stable in the range of potential encountered, and mixtures thereof 
Suitable electronically conductive materials include { HEAD ~ graphite } , { TAIL ~ carbon } , nickel powder , nickel plated steel , and other materials stable in the range of potential encountered , and mixtures thereof
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH