Chronology of call letters WBBM

• Date: ...June 30, 1924-March 29, 1941...
• Frequency:
  • 1330 khz (...June 30, 1924-June 30, 1926...)
  • 770 khz (...June 30, 1927-March 29, 1941)
  • 780 kHz (March 29, 1941...)
• Location:
  • Lincoln, Illinois (...June 30, 1924...)
  • Chicago, Illinois (...June 30, 1925-March 29, 1941...) ( NOTE: Shown as Glenview, Illinois in a listing dated June 30, 1928.)
• Owner of license:
  • Frank Atlass Produce Co. (...June 30, 1924...)
  • Atlass Investment Co. (...June 30, 1926-June 30, 1928...) ( Note that this does not actually appear to represent a change in ownership.)