In {HEAD ~ a preferred embodiment} of {TAIL ~ the invention}, the ends of the electrode terminal 12 have a greater resistance than the portion in between, so that the resistance near the ends of the terminal 12 increases gradually instead of increasing abruptly at the ends of the terminal 12 
In { HEAD ~ a preferred embodiment } of { TAIL ~ the invention } , the ends of the electrode terminal 12 have a greater resistance than the portion in between , so that the resistance near the ends of the terminal 12 increases gradually instead of increasing abruptly at the ends of the terminal 12
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