`whenYear` >='-3000'
AND `whenYear` ='1921'
AND `whenmonth` ='12' AND `whenDay` ='9'
ORDER BY `events`.`eventSig` DESC , `whenYear` ASC
LIMIT
0
,
200



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1921
Historical photo of General Motors in 1921part of interactive timeline of what happened in their life.

General Motors
in
U.S.
.
December 9 : a young engineer discovered adding tetraethyl lead to gasoline eliminated unpleasant engine knock or pinging #history

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