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Hydramatic
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<p>Hydramatic (also known as Hydra-Matic) is an <a href="/facts/Automatic_transmission/bKBFLbyh">automatic transmission</a> developed by both <a href="/facts/General_Motors_Corporation/rBgP3IRK">General Motors</a>' <a href="/facts/Cadillac/XIwEf3TI">Cadillac</a> and <a href="/facts/Oldsmobile/TIfEKkaz">Oldsmobile</a> divisions. Introduced in 1939 for the 1940 model year vehicles, the <i>Hydramatic</i> was the first mass-produced fully automatic transmission developed for passenger <a href="/facts/Automobile/I1IsH8IK">automobile</a> use. </p>