1615935

Information

• Patent Grant
• 1615935

• References
• Source

• Patent Number

  1,615,935

• Date Filed

  Not available

• Date Issued

  Tuesday, February 1, 1927
  97 years ago

• CPC

  • H04M5/12 - Ringing or otherwise calling substations

• US Classifications

  • 379 - Telephonic communications