656434

Information

• Patent Grant
• 656434

• References
• Source

• Patent Number

  656,434

• Date Filed

  Not available

• Date Issued

  Tuesday, August 21, 1900
  123 years ago

• CPC

  • G08B7/02 - using mechanical transmission

• US Classifications

  • 340 - Communications: electrical
  • 246 - Railway switches and signals