1337426

Information

• Patent Grant
• 1337426

• References
• Source

• Patent Number

  1,337,426

• Date Filed

  Not available

• Date Issued

  Tuesday, April 20, 1920
  105 years ago

• CPC

  • E01C23/0926 - with power-driven tools

• US Classifications

  • 173 - Tool driving or impacting
  • 299 - Mining or in situ disintegration of hard material