3898389

Information

• Patent Grant
• 3898389

• References
• Source

• Patent Number

  3,898,389

• Date Filed

  Not available

• Date Issued

  Tuesday, August 5, 1975
  49 years ago

• CPC

  • H04M19/006 - Circuits for increasing the range of current supply source

• US Classifications

  • 379 - Telephonic communications