1702680

Information

• Patent Grant
• 1702680

• References
• Source

• Patent Number

  1,702,680

• Date Filed

  Not available

• Date Issued

  Tuesday, February 19, 1929
  96 years ago

• CPC

  • E21B4/08 - impact being obtained by gravity only

• US Classifications

  • 175 - Boring or penetrating the earth