| Saturday, August 16th, 1980 | Placed MR Mao Gou on the 15-day disabled list. | Thursday, July 10th, 1980 | Activated SP Ryobe Takeuchi from the disabled list. | Wednesday, July 9th, 1980 | Placed SS Miguel Paredes on the 15-day disabled list. | Sunday, June 29th, 1980 | Placed CL Ángel López on the 15-day disabled list. | Wednesday, June 25th, 1980 | Placed SP Ryobe Takeuchi on the 15-day disabled list. | Tuesday, April 1st, 1980 | Activated SP Ryobe Takeuchi from the disabled list. | Sunday, September 16th, 1979 | Signed pitching coach Andrés Rincón. | |
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