CREATE TABLE "all_steel_coaches_donnerb_chsen" (
  "class_to_1928" text,
  "class_from_1928" text,
  "seats" text,
  "quantity" real,
  "year_s_of_manufacture" text
);

Question: What's the sum of Quantity for the Class of 1928 of CI-30?
SQL: SELECT SUM("quantity") FROM "all_steel_coaches_donnerb_chsen" WHERE "class_from_1928"='ci-30';

Question: What Class to 1928 has the Quantity smaller than 440 and Seats of 29/29?
SQL: SELECT "class_to_1928" FROM "all_steel_coaches_donnerb_chsen" WHERE "quantity"<440 AND "seats"='29/29';