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| Monday, June 6th , 1904 |
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| Promoted RP Charlie Calder to Major League Catano. |
| Tuesday, May 3rd , 1904 |
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| Promoted SP Pablo Cuevas to Major League Catano. |
| Promoted SP Eugenio Aranda to Major League Catano. |
| Monday, May 2nd , 1904 |
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| Released 1B Gerardo Quiroz. |
| Released C Lewis Watson. |
| Released 3B Edén Gaona. |
| Released RF David Morales. |
| Released 1B Rufo Romero. |
| RP Rodrigo García joins the team. |
| RP Pablo Cuevas joins the team. |
| RP Eugenio Aranda joins the team. |
| RP Charlie Calder joins the team. |
| C Faustino Linares joins the team. |
| C Roque Guzmán joins the team. |
| 2B Mateo Serrano joins the team. |
| 3B José Rivas joins the team. |
| SS Mateo Hernández joins the team. |
| 2B Luis Soto joins the team. |
| 1B George Simmonds joins the team. |
| SS Javier Muñoz joins the team. |
| 1B Bryan Arbuckle joins the team. |
| SS Enrique Páramo joins the team. |
| 1B Belerofón Hernández joins the team. |
| SS Albert Leprêtre joins the team. |
| CF Matías Luján joins the team. |
| CF Elliot McFarlane joins the team. |
| LF Néstor Solario joins the team. |
| LF Aldo García joins the team. |
| LF José Chavarín joins the team. |
| C Patricio Casas joins the team. |
| Monday, April 4th , 1904 |
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| Received RP Gerardo Ybarra from Major League Catano. |
| Received RP Efraín Pérez from Major League Catano. |
| Received RP Cicerón Peláez from Major League Catano. |
| Received C Florencio Flores from Major League Catano. |
| Received C Lewis Watson from Major League Catano. |
| Received 1B Felipe Flores from Major League Catano. |
| Received 1B Rufo Romero from Major League Catano. |
| Received CF Lorenzo Santillán from Major League Catano. |
| Received RF Gregorio Navedo from Major League Catano. |
| Received 1B Gerardo Quiroz from Major League Catano. |
| Received RF Ananías Flores from Major League Catano. |
| Received CF Edén Gaona from Major League Catano. |
| Received RF David Morales from Major League Catano. |
| Promoted RF David Morales to Major League Catano. |
| Received RF Beattie Crummack from Major League Catano. |
| Received RF David Morales from Major League Catano. |
| Monday, March 28th , 1904 |
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| Received RP Nemesio Adán from Major League Catano. |
| Received RP Atanasio Sánchez from Major League Catano. |
| Received RP Rafael González from Major League Catano. |
| Monday, February 22nd , 1904 |
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| Promoted SP Nemesio Adán to Major League Catano. |
| Promoted RP Oscar Rodríguez to Major League Catano. |
| Promoted SP Keegan Daly to Major League Catano. |
| Promoted SP Gavin Jones to Major League Catano. |
| Promoted SP Victoriano Islas to Major League Catano. |
| Promoted RP Atanasio Sánchez to Major League Catano. |
| Promoted RP Barry Wells to Major League Catano. |
| Promoted RP Gustavo Guerrero to Major League Catano. |
| Promoted 2B Estanislao Galbán to Major League Catano. |
| Promoted LF Pedro García to Major League Catano. |
| Promoted 1B Gerardo Quiroz to Major League Catano. |
| Promoted RF Gregorio Navedo to Major League Catano. |
| Promoted LF Lorenzo Santillán to Major League Catano. |
| Promoted 1B Rufo Romero to Major League Catano. |
| Promoted CF Edén Gaona to Major League Catano. |
| Promoted RF Ananías Flores to Major League Catano. |
| Promoted C Lewis Watson to Major League Catano. |
| Promoted C Florencio Flores to Major League Catano. |
| Promoted 3B Felipe Flores to Major League Catano. |
| Promoted RP Rafael González to Major League Catano. |
| Promoted RP Hércules Hernández to Major League Catano. |
| Promoted RP Efraín Pérez to Major League Catano. |
| Promoted RP Gerardo Ybarra to Major League Catano. |
| Promoted RP Cicerón Peláez to Major League Catano. |
| Saturday, February 13th , 1904 |
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| Received SP Victoriano Islas from Major League Catano. |
| Saturday, February 6th , 1904 |
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| Promoted 2B Jesús López to Major League Catano. |
| Received RF Pedro García from Major League Catano. |
| Received SP Gustavo Guerrero from Major League Catano. |
| Received SP Barry Wells from Major League Catano. |
| Received SP Gavin Jones from Major League Catano. |
| Received C Lewis Watson from Major League Catano. |
| Saturday, January 30th , 1904 |
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| Received SP Hércules Hernández from Major League Catano. |
| Received SP Rafael González from Major League Catano. |
| Sunday, January 24th , 1904 |
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| Received 2B Estanislao Galbán from Major League Catano. |
| Saturday, January 23rd , 1904 |
|---|
| Promoted RP Oscar Rodríguez to Major League Catano. |
| Received RP Nemesio Adán from Major League Catano. |
| Released 3B Carlos Mendoza. |
| Released RP Hiram Montalbán. |
| Released LF Osiris Peixoto. |
| Received RP Oscar Rodríguez from Major League Catano. |
| Friday, January 22nd , 1904 |
|---|
| Promoted 1B Emanuel Cabrera to Major League Catano. |
| Received CF Lorenzo Santillán from Major League Catano. |
| Received RP Oscar Rodríguez from Major League Catano. |
| Received RP Hiram Montalbán from Major League Catano. |
| Received SP Gerardo Ybarra from Major League Catano. |
| Received CF Edén Gaona from Major League Catano. |
| Received 3B Felipe Flores from Major League Catano. |
| Received RP Atanasio Sánchez from Major League Catano. |
| Received SP Cicerón Peláez from Major League Catano. |
| Received CF Gregorio Navedo from Major League Catano. |
| Received RP Efraín Pérez from Major League Catano. |
| Received LF Rufo Romero from Major League Catano. |
| Received LF Osiris Peixoto from Major League Catano. |
| Received SP Keegan Daly from Major League Catano. |
| Received CF Gerardo Quiroz from Major League Catano. |
| Received CF Carlos Mendoza from Major League Catano. |
| Received RF Ananías Flores from Major League Catano. |
| Thursday, January 21st , 1904 |
|---|
| Signed General Manager Tomás Gómez. |
| Signed Manager Cirilo Mireles. |
| Signed Bench Coach Simeón Saldaño. |
| Signed Pitching Coach Nicolás Martínez. |
| Signed Hitting Coach Jorge Guzmán. |
| Signed Scouting Director Pedro Sarinana. |
| Signed Team Trainer Eduardo González. |
| Signed 1B Coach Leovigildo Tomala. |
| Signed 3B Coach Víctor Cantú. |
