2191612

Information

• Patent Grant
• 2191612

• References
• Source

• Patent Number

  2,191,612

• Date Filed

  Not available

• Date Issued

  Tuesday, February 27, 1940
  84 years ago

• CPC

  • H04M3/4876 - Time announcements

• US Classifications

  • 379 - Telephonic communications
  • 369 - Dynamic information storage or retrieval