1894358

Information

• Patent Grant
• 1894358

• References
• Source

• Patent Number

  1,894,358

• Date Filed

  Not available

• Date Issued

  Tuesday, January 17, 1933
  92 years ago

• CPC

  • E21B21/012 - using exhaust air from the drilling motor for blowing off the dust at the borehole entrance

• US Classifications

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