CREATE TABLE "table1_2417345_3" (
  "state_class" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_of_successors_formal_installation" text
);

Question: Who were the successors when the date the successors were installed was February 23, 1870?
SQL: SELECT "successor" FROM "table1_2417345_3" WHERE "date_of_successors_formal_installation"='February 23, 1870';

Question: Who was the vacator when the successor was formally installed on February 1, 1871?
SQL: SELECT "vacator" FROM "table1_2417345_3" WHERE "date_of_successors_formal_installation"='February 1, 1871';

Question: Who was the successor that was formally installed on March 30, 1870?
SQL: SELECT "successor" FROM "table1_2417345_3" WHERE "date_of_successors_formal_installation"='March 30, 1870';