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Shamrock Oil (first era)

1929–1968

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In 1967 Shamrock Oil Merged With Diamond Alkali To Form Diamond Shamrock, The Shamrock Stations Were Renamed Diamond Shamrock In 1968

Shamrock Oil (second era)

2001–2004

In 2001 Valero Energy Corporation Bought Diamond Shamrock, And Returned The Shamrock Name After A 33 Year Absence

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2004-present

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