3431737

Information

• Patent Grant
• 3431737

• References
• Source

• Patent Number

  3,431,737

• Date Filed

  Not available

• Date Issued

  Tuesday, March 11, 1969
  55 years ago

• CPC

  • E21D23/0047 - without essential shifting devices

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 248 - Supports