2356031

Information

• Patent Grant
• 2356031

• References
• Source

• Patent Number

  2,356,031

• Date Filed

  Not available

• Date Issued

  Tuesday, August 15, 1944
  80 years ago

• CPC

  • H04M5/12 - Ringing or otherwise calling substations

• US Classifications

  • 379 - Telephonic communications