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Shamrock[]

1929–1980[]

Shamrockolder

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[]

Shamrockmodern
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