2185687

Information

• Patent Grant
• 2185687

• References
• Source

• Patent Number

  2,185,687

• Date Filed

  Not available

• Date Issued

  Tuesday, January 2, 1940
  84 years ago

• CPC

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

• US Classifications

  • 370 - Multiplex communications