1923487

Information

• Patent Grant
• 1923487

• References
• Source

• Patent Number

  1,923,487

• Date Filed

  Not available

• Date Issued

  Tuesday, August 22, 1933
  91 years ago

• CPC

  • E21B10/54 - the bit being of the rotary drag type
  • Y10S76/05 - Electric welding

• US Classifications

  • 175 - Boring or penetrating the earth
  • 076 - Metal tools and implements, making