2769172

Information

• Patent Grant
• 2769172

• References
• Source

• Patent Number

  2,769,172

• Date Filed

  Not available

• Date Issued

  Tuesday, October 30, 1956
  68 years ago

• CPC

  • E01B27/021 - by devices moving underneath the track

• US Classifications

  • 104 - Railways
  • 172 - Earth working