Word: tetraethyl
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Dates: during 1970-1979
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...price of the average new car by 10% or more -but that is not the most immediate problem. The key antipollution device is the "catalytic converter" that burns up hydrocarbons in the exhaust. The trouble is that the converter is eventually gummed up and rendered useless by the tetraethyl lead in present-day gasolines...