2581667

Information

• Patent Grant
• 2581667

• References
• Source

• Patent Number

  2,581,667

• Date Filed

  Not available

• Date Issued

  Tuesday, January 8, 1952
  73 years ago

• CPC

  • E21C37/10 - Devices with expanding elastic casings

• US Classifications

  • 173 - Tool driving or impacting
  • 056 - Harvesters
  • 175 - Boring or penetrating the earth