1407572

Information

• Patent Grant
• 1407572

• References
• Source

• Patent Number

  1,407,572

• Date Filed

  Not available

• Date Issued

  Tuesday, February 21, 1922
  103 years ago

• CPC

  • H04L15/16 - with keyboard co-operating with code discs

• US Classifications

  • 178 - Telegraphy