1561531

Information

• Patent Grant
• 1561531

• References
• Source

• Patent Number

  1,561,531

• Date Filed

  Not available

• Date Issued

  Tuesday, November 17, 1925
  99 years ago

• CPC

  • H04L15/04 - Apparatus or circuits at the transmitting end

• US Classifications

  • 178 - Telegraphy