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A chemist delivered a small amount of tetraethyllead, or TEL, on the morning of Dec. 9.
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Five years earlier, a chemical engineer working for General Motors had discovered that tetraethyllead cured a stubborn knocking problem in the car engines.
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David Turner, a former sales and marketing director for tetraethyllead, pleaded guilty at Southwark Crown Court on Jan. 17 and is awaiting sentencing.
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Tetraethyllead was nothing new back then; it was actually a 19th century discovery from European laboratories.