3091187

Information

• Patent Grant
• 3091187

• References
• Source

• Patent Number

  3,091,187

• Date Filed

  Not available

• Date Issued

  Tuesday, May 28, 1963
  61 years ago

• CPC

  • E01B27/021 - by devices moving underneath the track

• US Classifications

  • 104 - Railways
  • 037 - Excavating