981409

Information

• Patent Grant
• 981409

• References
• Source

• Patent Number

  981,409

• Date Filed

  Not available

• Date Issued

  Tuesday, January 10, 1911
  114 years ago

• CPC

  • E21B21/015 - Means engaging the bore entrance
  • Y10S29/089 - Gas entrained liquid supply
  • Y10S29/09 - Elevated tank supply

• US Classifications

  • 175 - Boring or penetrating the earth
  • 029 - Metal working
  • 173 - Tool driving or impacting