3020853

Information

• Patent Grant
• 3020853

• References
• Source

• Patent Number

  3,020,853

• Date Filed

  Not available

• Date Issued

  Tuesday, February 13, 1962
  62 years ago

• CPC

  • E01B27/021 - by devices moving underneath the track

• US Classifications

  • 104 - Railways
  • 037 - Excavating