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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 8, 1956
Released Andy Seminick.
October 11, 1956
Traded Stu Miller to the New York Giants. Received Jim Hearn.
October 15, 1956
Sold Ben Flowers to the Kansas City Athletics.
Jack Lamabe granted Free Agency.
November 19, 1956
Traded Del Ennis to the St. Louis Cardinals. Received Bobby Morgan and Rip Repulski.
December 3, 1956
Jack Spring drafted by the Boston Red Sox in the 1956 rule 5 draft.
1957
Signed Tony Curry as an amateur free agent.
Signed John Kennedy as a free agent.
Signed Ed Olivares as an amateur free agent.
Signed Bobby Wine as an amateur free agent.
January 27, 1957
Signed Wayne Graham as an amateur free agent.
March, 1957
Signed Chuck Essegian as a free agent.
April 1, 1957 (Standings)
The Kansas City Athletics returned Ben Flowers following previous purchase. (Date given is approximate. Exact date is uncertain.)
April 5, 1957 (Standings)
Traded a player to be named later, Mel Geho (minors), Tim Harkness, Ron Negray, Elmer Valo and $75,000 to the Brooklyn Dodgers. Received Chico Fernandez. The Philadelphia Phillies sent Ben Flowers (April 8, 1957) to the Brooklyn Dodgers to complete the trade.
May 10, 1957 (Standings)
Traded Glen Gorbous to the St. Louis Cardinals. Received Chuck Harmon.
May 13, 1957 (Standings)
Sold Bobby Morgan to the Chicago Cubs.
May 25, 1957 (Standings)
Purchased Joe Black from the Cincinnati Redlegs.
June 14, 1957 (Standings)
Signed Chris Short as an amateur free agent.
June 17, 1957 (Standings)
Released Frank Baumholtz.
June 19, 1957 (Standings)
Signed Ed Keegan as an amateur free agent.
June 20, 1957 (Standings)
Purchased Bobby Young from the Cleveland Indians.
June 26, 1957 (Standings)
Selected Warren Hacker off waivers from the Cincinnati Redlegs.
July 3, 1957 (Standings)
Signed Mickey Harrington as an amateur free agent.
July 5, 1957 (Standings)
Released Joe Black.
July 30, 1957 (Standings)
Signed Ron Northey as a free agent.
September 1, 1957 (Standings)
Signed Andy Seminick as a free agent.
October 15, 1957 (Standings)
Released Ron Northey.
October 29, 1957
Signed George Williams as an amateur free agent.
December 2, 1957
Drafted Johnny Gray from the Cleveland Indians in the 1957 rule 5 draft.
December 11, 1957
Purchased Dave Philley from the Detroit Tigers.
December 16, 1957
Traded Harvey Haddix to the Cincinnati Redlegs. Received Wally Post.
December 19, 1957
Released Andy Seminick.
1958
Ed Olivares sent to the St. Louis Cardinals in an unknown transaction.
Jim Snyder received from the Chicago Cubs in an unknown transaction.
January 28, 1958
Signed Jacke Davis as an amateur free agent.
March 20, 1958
Purchased Joe Collins from the New York Yankees.