CREATE TABLE table_24994 ("Year" CLOB, "Date" CLOB, "Driver" CLOB, "Team" CLOB, "Manufacturer" CLOB, "Laps" CLOB, "Miles  ( km ) " CLOB, "Race Time" CLOB, "Average Speed  ( mph ) " CLOB, "Report" CLOB)

Who made the car that won the race on May 21?
SELECT "Manufacturer" FROM table_24994 WHERE "Date" = 'May 21'
SELECT "Manufacturer" FROM "table_24994" WHERE "Date" = 'May 21'