1540835

Information

• Patent Grant
• 1540835

• References
• Source

• Patent Number

  1,540,835

• Date Filed

  Not available

• Date Issued

  Tuesday, June 9, 1925
  99 years ago

• CPC

  • H04L5/06 - the signals being represented by different frequencies
  • H04L15/28 - Code reproducing apparatus

• US Classifications

  • 178 - Telegraphy
  • 370 - Multiplex communications