Lou Gorman

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San Francisco Giants acquire	Date	Seattle Mariners acquire
cash	June 20, 1980	Marc Hill

San Francisco Giants acquire	Date	Seattle Mariners acquire
cash	June 16, 1980	Casey Parsons

Seattle Mariners acquire	Date	Pittsburgh Pirates acquire
Dave A. Roberts	April 24, 1980	cash

Chicago Cubs acquire	Date	Seattle Mariners acquire
Lenny Randle	April 2, 1980	cash

Seattle Mariners acquire	Date	Pittsburgh Pirates acquire
cash Player to be named later (Larry Andersen)	April 1, 1980	Odell Jones

Cleveland Indians acquire	Date	Seattle Mariners acquire
Rafael Vasquez Rob Pietroburgo Player to be named later (Bud Andersen)	December 6, 1979	Ted Cox

St-Louis Cardinals acquire	Date	Seattle Mariners acquire
cash	November 9, 1979	Dan O'Brien

Seattle Mariners acquire	Date	New York Yankees acquire
Jerry Narron Jim Beattie Juan Beniquez Rick Anderson	November 1, 1979	Ruppert Jones Jim Lewis

Los Angeles Angels acquire	Date	Seattle Mariners acquire
John Montague	August 29, 1979	Player to be named later (Jim L. Anderson)

Seattle Mariners acquire	Date	New York Mets acquire
Wayne Twitchell	August 19, 1979	cash

Seattle Mariners acquire	Date	Chicago White Sox acquire
Rich Hinton	July 6, 1979	Juan Bernhardt

St-Louis Cardinals acquire	Date	Seattle Mariners acquire
cash	June 7, 1979	Rob Dressler

Milwaukee Brewers acquire	Date	Seattle Mariners acquire
Paul Mitchell	June 7, 1979	Randy Stein

Los Angeles Dodgers acquire	Date	Seattle Mariners acquire
cash	March 28, 1979	Joe Simpson

Chicago Cubs acquire	Date	Seattle Mariners acquire
Luis Delgado	March 20, 1979	Larry Cox

Atlanta Braves acquire	Date	Seattle Mariners acquire
cash	February 23, 1979	Mike Davey

Houston Astros acquire	Date	Seattle Mariners acquire
Craig Reynolds	December 8, 1978	Floyd Bannister

Seattle Mariners acquire	Date	Pittsburgh Pirates acquire
Mario Mendoza Odell Jones Rafael Vazquez	December 5, 1978	Enrique Romo Rick Jones Tom McMillan