CREATE TABLE table_28656 ("Name / designation" CLOB, "Year of introduction" CLOB, "Country of origin" CLOB, "Primary cartridge" CLOB, "primary user" CLOB)

If the country of Origin is South Africa, who is the primary user?
SELECT "primary user" FROM table_28656 WHERE "Country of origin" = 'South Africa'
SELECT "primary user" FROM "table_28656" WHERE "Country of origin" = 'South Africa'