2771269

Information

• Patent Grant
• 2771269

• References
• Source

• Patent Number

  2,771,269

• Date Filed

  Not available

• Date Issued

  Tuesday, November 20, 1956
  68 years ago

• CPC

  • E21B7/16 - Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling

• US Classifications

  • 175 - Boring or penetrating the earth
  • 451 - Abrading