CREATE TABLE table_68919 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

Name the entrant for 1975 and chassis of hill gh1
SELECT "Entrant" FROM table_68919 WHERE "Year" = '1975' AND "Chassis" = 'hill gh1'
SELECT "Entrant" FROM "table_68919" WHERE "Chassis" = 'hill gh1' AND "Year" = '1975'