1920-10-30 Montana_Refining_Inc1920-10-31 Montana_Refining_Erecting Oil_Refinery 1920-12-29 Montana_Refining_Ad 1921-03-24 Montana_Refining 1921-05-01 Montana_Refining_Co_Sets August_Drilling_Start 1921-08-07 Montana_Refining_Co 1922-03-30 Montana_Refining_Co__Doubles 1922-07-12 Large_Indy_Acquires Montana_Refining