2209513

Information

• Patent Grant
• 2209513

• References
• Source

• Patent Number

  2,209,513

• Date Filed

  Not available

• Date Issued

  Tuesday, July 30, 1940
  85 years ago

• CPC

  • H04Q3/00 - Selecting arrangements
  • H04M3/52 - Arrangements for routing dead number calls to operators
  • H04M5/10 - using separate plug for each subscriber

• US Classifications

  • 379 - Telephonic communications