Chronology of call letters WPM

• Date: March 14, 1922-May 10, 1923
• Frequency:
  • 833 khz (...April 1, 1922-June 30, 1922...)
• Location:
  • Washington, District of Columbia (March 14, 1922-May 10, 1923)
• Owner of license:
  • Thomas J. Williams (...April 1, 1922-June 30, 1922...)