642662

Information

• Patent Grant
• 642662

• References
• Source

• Patent Number

  642,662

• Date Filed

  Not available

• Date Issued

  Tuesday, February 6, 1900
  124 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
  • 318 - Electricity: motive power systems