2917282

Information

• Patent Grant
• 2917282

• References
• Source

• Patent Number

  2,917,282

• Date Filed

  Not available

• Date Issued

  Tuesday, December 15, 1959
  65 years ago

• CPC

  • E21B7/025 - Rock drills
  • E21D11/03 - using timber- setting machines

• US Classifications

  • 248 - Supports
  • 172 - Earth working
  • 173 - Tool driving or impacting