CREATE TABLE table_72174 ("District" TEXT, "Vacator" TEXT, "Reason for change" TEXT, "Successor" TEXT, "Date successor seated" TEXT)

When was the date successor seated when the vacator was charles e. chamberlain (r)?
SELECT "Date successor seated" FROM table_72174 WHERE "Vacator" = 'Charles E. Chamberlain (R)'
SELECT "Date successor seated" FROM "table_72174" WHERE "Vacator" = 'Charles E. Chamberlain (R)'