Chronology of call letters CYR

• Date: ...March 1925-1929... ( Note: Station is shown in an April 1929 RADEX listing, but a note from a reader in the same issue indicates that at least one other Mexican station had been changed from CZE to XFX, so this date is questionable.)
• Frequency:
  • Unknown (...March 1925-1929...)
• Location:
  • Mazatlán, Sinaloa, Mexico (...March 1925-1929...)
• Owner of license:
  • Rosseter y Cia (...March 1925...)
  • Castulo Llamas (...January 31, 1927-1929...)