2756020

Information

• Patent Grant
• 2756020

• References
• Source

• Patent Number

  2,756,020

• Date Filed

  Not available

• Date Issued

  Tuesday, July 24, 1956
  69 years ago

• CPC

  • E03B3/11 - in combination with tubes

• US Classifications

  • 175 - Boring or penetrating the earth
  • 173 - Tool driving or impacting
  • 405 - Hydraulic and earth engineering