| Sunday, September 21st, 1980 | Activated 3B Larry McCluney from the disabled list. | Saturday, September 13th, 1980 | Placed 3B David Bell on the 9-day disabled list. | Saturday, September 6th, 1980 | Placed 3B Larry McCluney on the 9-day disabled list. | Wednesday, August 13th, 1980 | Signed Jerry Williams to a minor league contract with a signing bonus of $66,300. | Saturday, August 9th, 1980 | Signed Eric Hall to a minor league contract with a signing bonus of $152,100. | Friday, August 8th, 1980 | Signed Craig Miller to a minor league contract with a signing bonus of $47,700. | Thursday, July 17th, 1980 | Activated SS Jorge Feliciano from the 60-day disabled list. | 3B Manny Pérez was designated for assignment and placed on waivers (from active). | Tuesday, June 24th, 1980 | Signed Jamal Crocker to a minor league contract with a signing bonus of $180,100. | Monday, March 31st, 1980 | Placed C Matt Peterson on the 9-day disabled list. | Monday, March 10th, 1980 | Activated MR Javier Ortíz from the 60-day disabled list. | MR Jarrod Rose was designated for assignment, placed on waivers and taken off the 40-man roster. | Friday, February 15th, 1980 | Activated MR Johnny Shelton from the 60-day disabled list. | MR Bob Joyner was designated for assignment, placed on waivers and taken off the 40-man roster. | |
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