1507493

Information

• Patent Grant
• 1507493

• References
• Source

• Patent Number

  1,507,493

• Date Filed

  Not available

• Date Issued

  Tuesday, September 2, 1924
  100 years ago

• CPC

  • B61L7/106 - for form signals

• US Classifications

  • 246 - Railway switches and signals
  • 200 - Electricity: circuit makers and breakers