1509404

Information

• Patent Grant
• 1509404

• References
• Source

• Patent Number

  1,509,404

• Date Filed

  Not available

• Date Issued

  Tuesday, September 23, 1924
  100 years ago

• CPC

  • E01C1/007 - Design or auxiliary structures for compelling drivers to slow down or to proceed with caution
  • E01F9/529 - specially adapted for signaling by sound or vibrations

• US Classifications

  • 238 - Railways: surface track
  • 404 - Road structure, process, or apparatus