430551

Information

• Patent Grant
• 430551

• References
• Source

• Patent Number

  430,551

• Date Filed

  Not available

• Date Issued

  Tuesday, June 17, 1890
  134 years ago

• CPC

  • G07C5/12 - in graphical form
  • G01D9/20 - the recording element

• US Classifications

  • 346 - Recorders
  • 340 - Communications: electrical