Table: donnerbuchse_vehicle
Columns: class_to_1928
class_from_1928
seats
quantity
year_s_of_manufacture

Question: What's the sum of Quantity for the Class of 1928 of CI-30?
SQL: SELECT SUM("quantity") FROM donnerbuchse_vehicle 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 donnerbuchse_vehicle WHERE "quantity" < 440 AND "seats" = '29/29'