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Delta Plan Oy was a Finnish bus builder that was established originally as Autokori Oy in 1935 in Turku, Finland. (The factory is the present day Volvo Bus Finland Turku factory). By 1966, Autokori was exporting buses to Sweden. In 1973 as the company expanded, the name was changed to Delta Plan Oy. In 1982, Ajokki Oy purchases Delta Plan and establishes the Ajokki Group.
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- Delta Superstar