CREATE TABLE table_62608 ("Year" FLOAT, "Network" CLOB, "Play-by-play" CLOB, "Colour commentator ( s ) " CLOB, "Pregame host" CLOB)

Who was the pregame host before 1992 when there was a play by play of Bob Irving?
SELECT "Pregame host" FROM table_62608 WHERE "Year" < '1992' AND "Play-by-play" = 'bob irving'
SELECT "Pregame host" FROM "table_62608" WHERE "Play-by-play" = 'bob irving' AND "Year" < '1992'