Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Visitor | Score | Home | Record |
| --- | --- | --- | --- | --- |
| May 4 | Montreal Canadiens | 1–2 | Chicago Black Hawks | 1-0 |
| May 6 | Montreal Canadiens | 3–5 | Chicago Black Hawks | 2-0 |
| May 9 | Chicago Black Hawks | 2–4 | Montreal Canadiens | 2-1 |
| May 11 | Chicago Black Hawks | 2–5 | Montreal Canadiens | 2-2 |
| May 13 | Montreal Canadiens | 0–2 | Chicago Black Hawks | 3-2 |
| May 16 | Chicago Black Hawks | 3–4 | Montreal Canadiens | 3-3 |
| May 18 | Montreal Canadiens | 3–2 | Chicago Black Hawks | 3-4 |
Question:
What is Visitor, when Date is "May 9"?
Answer:
Chicago Black Hawks