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Shamrock

1929–1980

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In 1967 Shamrock Oil Merged With Diamond Alkali To Form Diamond Shamrock, The Shamrock Stations Were Renamed Diamond Shamrock In 1980

Shamrock Oil

2001–2004

In 2001 Valero Energy Corporation Bought Diamond Shamrock, And Returned The Shamrock Name After A 21 Year Absence

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2004-present

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