1840434

Information

• Patent Grant
• 1840434

• References
• Source

• Patent Number

  1,840,434

• Date Filed

  Not available

• Date Issued

  Tuesday, January 12, 1932
  93 years ago

• CPC

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

• US Classifications

  • 333 - Wave transmission lines and networks
  • 379 - Telephonic communications