3924691

Information

• Patent Grant
• 3924691

• References
• Source

• Patent Number

  3,924,691

• Date Filed

  Not available

• Date Issued

  Tuesday, December 9, 1975
  49 years ago

• CPC

  • E21C3/18 - directly by a piston of an internal-combustion engine
  • E21B6/00 - Drives for combined percussion and rotary drilling

• US Classifications

  • 173 - Tool driving or impacting