3156772

Information

• Patent Grant
• 3156772

• References
• Source

• Patent Number

  3,156,772

• Date Filed

  Not available

• Date Issued

  Tuesday, November 10, 1964
  60 years ago

• CPC

  • H04M15/18 - according to duration of the call , or the communication

• US Classifications

  • 379 - Telephonic communications
  • 365 - Static information storage and retrieval