A spark plug has a metal threaded shell, electrically isolated from a central electrode by a porcelain insulator. The central electrode, which may contain a resistor, is connected by a heavily insulated wire to the output terminal of an ignition coil or magneto.
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The company employs about 380,000 people and in 2010 it stopped disclosing its US headcount, amidst criticisms that it has been offshoring jobs to countries like India. This is the kind of thing Trump campaigned against. He even criticized IBM's layoffs in a Nov. 6 campaign speech in Minnesota, the Wall Street Journal reported.