แชสซี kurtis kraft 500a คือปีใด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What is the year with a kurtis kraft 500a chassis?It is not neccessary to use all the tables.
 table_71618:  "Year" [ real]  "Entrant" [ text]  "Chassis" [ text]  "Engine" [ text]  "Points" [ real] 
SELECT SUM("Year") FROM table_71618 WHERE "Chassis" = 'kurtis kraft 500a'