1352589

Information

• Patent Grant
• 1352589

• References
• Source

• Patent Number

  1,352,589

• Date Filed

  Not available

• Date Issued

  Tuesday, September 14, 1920
  103 years ago

• CPC

  • H04J7/02 - in which the polarity of the amplitude is characteristic

• US Classifications

  • 370 - Multiplex communications
  • 313 - Electric lamp and discharge devices