CREATE TABLE "table1_2417345_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);

Question: When was successor George E. Harris (R) seated?
SQL: SELECT "date_successor_seated" FROM "table1_2417345_4" WHERE "successor"='George E. Harris (R)';

Question: What was the reason for change when the successor was William Milnes, Jr. (C)?
SQL: SELECT "reason_for_change" FROM "table1_2417345_4" WHERE "successor"='William Milnes, Jr. (C)';

Question: When were the successor/s seated for Ohio 10th?
SQL: SELECT "date_successor_seated" FROM "table1_2417345_4" WHERE "district"='Ohio 10th';

Question: Name the reason for change when George W. Greene (D) was the vacator.
SQL: SELECT "reason_for_change" FROM "table1_2417345_4" WHERE "vacator"='George W. Greene (D)';

Question: When was successor David Atwood (R) seated?
SQL: SELECT "date_successor_seated" FROM "table1_2417345_4" WHERE "successor"='David Atwood (R)';