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| Tuesday, November 8th , 1904 |
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| 1B Rodrigo Rivera retired from professional baseball. |
| Tuesday, September 27th , 1904 |
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| Signed Scouting Director Rubén Contreras. |
| Tuesday, July 5th , 1904 |
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| Signed 3B Coach Ramón Pereira. |
| Tuesday, June 7th , 1904 |
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| Signed Pitching Coach Marcus Coleman. |
| Tuesday, April 26th , 1904 |
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| Signed Manager Sean Webster. |
| Sunday, February 14th , 1904 |
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| Signed Hitting Coach Brady Counterman. |
| Sunday, February 7th , 1904 |
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| Signed Team Trainer Íñigo Galván. |
| Sunday, January 31st , 1904 |
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| Signed General Manager Armando Lupercio. |
| Thursday, January 21st , 1904 |
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| Sold the contract of SP Owen Coates to the Naguabo Navegadores. |
| Released SP Andrónico Carrera. |
| Released C Bernal Castillo. |
| Released 2B Bartolomé Chávez. |
| Released 1B Alfredo Colorado. |
| Released C Julio Echevarría. |
| Released SP Isma'il Farraj. |
| Released LF Marcos Farías. |
| Released 2B Aldo Fuentes. |
| Released SS Ramiro Guevara. |
| Released SP Marcos Luna. |
| Released RF Flaminio Madrigal. |
| Released 2B Zoilo Martín. |
| Released CL Martín Rodríguez. |
| Released 3B Ángel Silvas. |
| Released RF Eugenio Subia. |
| Released CF Quilón Torres. |
| Released C Erasmo Vásquez. |
| Friday, January 15th , 1904 |
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| Released SP Tomás Rangel. |
| Released CL Guillermo Rivera. |
| Released SP Jorge Navarro. |
| Released SP Gerardo Tinajero. |
| Released SS Marcial Díaz. |
| Released SP Danilo Godínez. |
| Released 1B Miguel Estrada. |
| Released 2B Casto Cordova. |
| Released RF Juan María Estévez. |
| Released 3B Roberto Gómez. |
| Released RF Damián Almanza. |
| Released C Víctor Cruz. |
| Released 1B Palamedes Briceño. |
| Released 1B Santiago González. |
| Released RF Ángel Quiñones. |
| Released CF Felipe Botello. |
| Released C Nemesio Miranda. |
| Released SS Luis Ortiz. |
| Released 2B Gualterio Estrada. |
| Released 1B Dámaso Ibarra. |
| Released LF Roano Soto. |
| Released LF Príamo González. |
| Released 2B Bill Lauterborn. |
| Released RF Owen Jones. |
| Released 2B Terrence Wilder. |
| Released LF Alarico Herrera. |
| Released RP Sean McManus. |
| Released C Chandler King. |
