Question: Who is the vacator for the February 1, 1971 date of successor's formal installation?
SQL: SELECT "Vacator" FROM "2-1199219-1" WHERE "Date of successor's formal installation" = 'February 1, 1971';

Question: What is the state of the senator with a November 14, 1972 date of successor's formal installation?
SQL: SELECT "State (class)" FROM "2-1199219-1" WHERE "Date of successor's formal installation" = 'November 14, 1972';