1740761

Information

• Patent Grant
• 1740761

• References
• Source

• Patent Number

  1,740,761

• Date Filed

  Not available

• Date Issued

  Tuesday, December 24, 1929
  95 years ago

• CPC

  • E21B17/22 - Rods or pipes with helical structure
  • E21B10/44 - Bits with helical conveying portion
  • E21C1/10 - with a built-in feeding device

• US Classifications

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