CREATE TABLE table_76337 ("Name" CLOB, "Background" CLOB, "Title" CLOB, "Appointment" CLOB, "Presentation of Credentials" CLOB)

Who presented their credentials at an unknown date?
SELECT "Name" FROM table_76337 WHERE "Presentation of Credentials" = 'unknown'
SELECT "Name" FROM "table_76337" WHERE "Presentation of Credentials" = 'unknown'