Still further in {TAIL ~ accordance} with the present invention, the pipe to soil potential measurement may be made utilizing electrical ground cables or {HEAD ~ similar structures} in urban areas in the vicinity of power grid substations, for example 
Still further in { TAIL ~ accordance } with the present invention , the pipe to soil potential measurement may be made utilizing electrical ground cables or { HEAD ~ similar structures } in urban areas in the vicinity of power grid substations , for example
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