user: Question: What is the date of the game where the line judge was Bob Beeks, the head linesman was Jerry Bergman, and Paul Baetz was the back judge?
Columns: ['Game', 'Date', 'Referee', 'Umpire', 'Head Linesman', 'Line Judge', 'Field Judge', 'Back Judge']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['V', '17 January 1971', 'Norm Schachter', 'Paul Trepinski', 'Ed Marion', 'Jack Fette', 'Fritz Graf', 'Hugh Gamber']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Line Judge" = 'Bob Beeks' AND "Head Linesman" = 'Jerry Bergman' AND "Back Judge" = 'Paul Baetz';