| Wednesday, September 10th, 1980 | Activated SS António Ruíz from the disabled list. | Monday, August 11th, 1980 | Signed Bill Goodwin to a minor league contract with a signing bonus of $448,700. | Sunday, August 10th, 1980 | Signed Ramón Uribe to a minor league contract with a signing bonus of $70,900. | Friday, August 8th, 1980 | Signed Pedro Sánchez to a minor league contract with a signing bonus of $34,500. | Thursday, July 10th, 1980 | MR Artie Williamson was designated for assignment, placed on waivers and taken off the 40-man roster. | Friday, July 4th, 1980 | Signed Raúl García to a minor league contract with a signing bonus of $140,800. | Friday, June 27th, 1980 | Purchased the contract of SP Salvador Marín from Double A Anaheim. | SP Naofumi Hatsutori was designated for assignment, placed on waivers and taken off the 40-man roster. | Thursday, June 26th, 1980 | Signed Earl Hughes to a minor league contract with a signing bonus of $19,900. | Sunday, April 6th, 1980 | Placed SS Darren Payne on the 9-day disabled list. | Tuesday, October 30th, 1979 | Signed free agent CL Leonard Owens to a 1-year contract worth a total of $60,800. | Friday, October 19th, 1979 | Signed bench coach Ángel Gonzáles to a 5-year, $110,200 per year contract. | |
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