2668690

Information

• Patent Grant
• 2668690

• References
• Source

• Patent Number

  2,668,690

• Date Filed

  Not available

• Date Issued

  Tuesday, February 9, 1954
  70 years ago

• CPC

  • E21B44/08 - in response to the amplitude of the movement of the percussion tool

• US Classifications

  • 173 - Tool driving or impacting