2224439

Information

• Patent Grant
• 2224439

• References
• Source

• Patent Number

  2,224,439

• Date Filed

  Not available

• Date Issued

  Tuesday, December 10, 1940
  84 years ago

• CPC

  • E21B4/12 - Electrically operated hammers

• US Classifications

  • 173 - Tool driving or impacting
  • 175 - Boring or penetrating the earth
  • 439 - Electrical connectors