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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 14, 1903
Signed Jim Mullin as an amateur free agent.
August, 1904 (Standings)
Purchased Fred Applegate from Toronto (Eastern). (Date given is approximate. Exact date is uncertain.)
August 31, 1904 (Standings)
Loaned Jim Mullin to the Philadelphia Athletics.
September 21, 1904 (Standings)
Jim Mullin returned by the Washington Senators as part of earlier loan.