3876840

Information

• Patent Grant
• 3876840

• References
• Source

• Patent Number

  3,876,840

• Date Filed

  Not available

• Date Issued

  Tuesday, April 8, 1975
  50 years ago

• CPC

  • H04M3/4876 - Time announcements

• US Classifications

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