Table: senate_vacancies
Columns: state_class
vacator
reason_for_change
successor
date_of_successors_formal_installation

Question: When did Orville H. Browning (r) succeed?
SQL: SELECT "date_of_successors_formal_installation" FROM senate_vacancies WHERE "successor" = 'Orville H. Browning (R)'

Question: List all dates of succession in the state class Missouri (3).
SQL: SELECT "date_of_successors_formal_installation" FROM senate_vacancies WHERE "state_class" = 'Missouri (3)'