136555

Information

• Patent Grant
• 136555

• References
• Source

• Patent Number

  136,555

• Date Filed

  Not available

• Date Issued

  Tuesday, March 4, 1873
  153 years ago

• CPC

  • E21B10/44 - Bits with helical conveying portion
  • Y10T408/898 - Helical ribbon Tool

• US Classifications

  • 175 - Boring or penetrating the earth
  • 408 - Cutting by use of rotating axially moving tool