1788007

Information

• Patent Grant
• 1788007

• References
• Source

• Patent Number

  1,788,007

• Date Filed

  Not available

• Date Issued

  Tuesday, January 6, 1931
  94 years ago

• CPC

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

• US Classifications

  • 379 - Telephonic communications