Conversation so far:
Were Al Kaline's final seasons successful?
In 1971, Al Kaline became the first Tiger to sign a $100,000 contract.
Who did Al Kaline sign with in 1971?
Al Kaline played his entire 22-year baseball career with the Detroit Tigers.

Question: When did he sign with them?
Self-contained rewrite: When did Al Kaline sign the $100,000 contract with The Tigers?