Table:
text: 1972–73 Chicago Black Hawks season
Chicago Black Hawks 4, St. Louis Blues 1
Chicago Black Hawks 4, St. Louis Blues 1
Date_ Visitor Score Home Record
April 4 St. Louis Blues 1–7 Chicago Black Hawks 1-0
April 5 St. Louis Blues 0–1 Chicago Black Hawks 2-0
April 7 Chicago Black Hawks 5–2 St. Louis Blues 3-0
April 8 Chicago Black Hawks 3–5 St. Louis Blues 3-1
April 10 St. Louis Blues 1–6 Chicago Black Hawks 4-1

Question: What is the Chicago Black Hawks April 4th St Louis Blues 1 1972-73 visiting team?