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| Saturday, May 14th , 1904 |
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| Placed 2B Jorge Pérez on the 7-day injured list, retroactive to 05/13/1904. |
| Wednesday, May 4th , 1904 |
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| Placed SP Ricardo Márquez on the 7-day injured list, retroactive to 05/02/1904. |
| Monday, May 2nd , 1904 |
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| Released LF Calímaco Robles. |
| Released 3B Rafael Rodríguez. |
| Released C José Rocha. |
| Released 1B Serapión Díaz. |
| SP Ricardo Márquez joins the team. |
| SP Gabriel Barajas joins the team. |
| SP Dagoberto Arredondo joins the team. |
| SP Acacio Velásquez joins the team. |
| RP Gabriel Benites joins the team. |
| RP Esteban Espinosa joins the team. |
| RP Félix Cervantes joins the team. |
| RP Carlos Velázquez joins the team. |
| RP Luis Beltrán joins the team. |
| RP Britomaro López joins the team. |
| C Urso Recio joins the team. |
| C Eudoxio Díaz joins the team. |
| 1B Pelayo Rodríguez joins the team. |
| LF Ramón Sabaría joins the team. |
| CF Pío Padilla joins the team. |
| RF Juan González joins the team. |
| 1B José Avilés joins the team. |
| SS Édgar Moral joins the team. |
| SS José Díaz joins the team. |
| 1B Venancio Pérez joins the team. |
| SS Jorge Pérez joins the team. |
| 1B César Guerrero joins the team. |
| SS Patrick Laing joins the team. |
| LF Oscar Richet joins the team. |
| RF Abundio Rivas joins the team. |
| CF Carmelo Pedroza joins the team. |
| CF Eumeo Briseño joins the team. |
| LF Ramón Lozano joins the team. |
| LF Noé Ruiz joins the team. |
| CF Gerardo Hernández joins the team. |
| Monday, April 18th , 1904 |
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| Received C José Rocha from Major League Aguada. |
| Monday, April 4th , 1904 |
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| Received C Roano Barron from Major League Aguada. |
| Received 1B Serapión Díaz from Major League Aguada. |
| Received 2B Manuel Martínez from Major League Aguada. |
| Received RF Pablo López from Major League Aguada. |
| Received LF Calímaco Robles from Major League Aguada. |
| Received 2B Nicolás Arias from Major League Aguada. |
| Received 3B Rafael Rodríguez from Major League Aguada. |
| Monday, February 22nd , 1904 |
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| Promoted SP Máximo Cabrera to Major League Aguada. |
| Promoted SP Ricardo Cruz to Major League Aguada. |
| Promoted SP Juan María Cantú to Major League Aguada. |
| Promoted 1B Victoriano Morales to Major League Aguada. |
| Promoted 3B Rafael Rodríguez to Major League Aguada. |
| Promoted C Martín Cisneros to Major League Aguada. |
| Promoted 1B Serapión Díaz to Major League Aguada. |
| Promoted CF Miguel Ramírez to Major League Aguada. |
| Promoted LF Calímaco Robles to Major League Aguada. |
| Promoted C Roano Barron to Major League Aguada. |
| Promoted 2B Manuel Martínez to Major League Aguada. |
| Promoted RF Pablo López to Major League Aguada. |
| Saturday, February 13th , 1904 |
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| Received 3B Victoriano Morales from Major League Aguada. |
| Received C Martín Cisneros from Major League Aguada. |
| Monday, January 25th , 1904 |
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| Received SP Máximo Cabrera from Major League Aguada. |
| Received RP Juan María Cantú from Major League Aguada. |
| Saturday, January 23rd , 1904 |
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| Received RP Ricardo Cruz from Major League Aguada. |
| Thursday, January 21st , 1904 |
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| Signed Manager Hortensio López. |
| Signed Pitching Coach Esteban Martínez. |
| Signed Hitting Coach Cid Rodríguez. |
| Received RP Jaime Díaz from Major League Aguada. |
| Received RP Cecilio Hernández from Major League Aguada. |
| Received RP Luis Quiroz from Major League Aguada. |
| Received RP Benicio Reyes from Major League Aguada. |
| Received RP Mercuriano Urías from Major League Aguada. |
| Received C Premislao Reyes from Major League Aguada. |
| Received CF Miguel Ramírez from Major League Aguada. |
| Received 2B Sófocles Díaz from Major League Aguada. |
| Received SS Pablo López from Major League Aguada. |
| Received 2B Andrónico Castillo from Major League Aguada. |
| Received RF Gregorio Palacio from Major League Aguada. |
| Received LF Calímaco Robles from Major League Aguada. |
| Received 1B Serapión Díaz from Major League Aguada. |
| Received 3B Manuel Martínez from Major League Aguada. |
| Received 3B Rafael Rodríguez from Major League Aguada. |
| Released 2B Sófocles Díaz. |
| Released CF Gregorio Palacio. |
| Released SP Jaime Díaz. |
| Released SS Andrónico Castillo. |
| Released SP Luis Quiroz. |
| Released SP Benicio Reyes. |
| Released C Premislao Reyes. |
| Released SP Cecilio Hernández. |
| Released RP Mercuriano Urías. |
