1697933

Information

• Patent Grant
• 1697933

• References
• Source

• Patent Number

  1,697,933

• Date Filed

  Not available

• Date Issued

  Tuesday, January 8, 1929
  96 years ago

• CPC

  • H04B3/42 - Circuits for by-passing of ringing signals

• US Classifications

  • 370 - Multiplex communications
  • 379 - Telephonic communications