526220

Information

• Patent Grant
• 526220

• References
• Source

• Patent Number

  526,220

• Date Filed

  Not available

• Date Issued

  Tuesday, September 18, 1894
  130 years ago

• CPC

  • G08C19/02 - in which the signal transmitted is magnitude of current or voltage
  • H03M1/22 - Pattern-reading type

• US Classifications

  • 340 - Communications: electrical
  • 374 - Thermal measuring and testing