1330743

Information

• Patent Grant
• 1330743

• References
• Source

• Patent Number

  1,330,743

• Date Filed

  Not available

• Date Issued

  Tuesday, February 10, 1920
  104 years ago

• CPC

  • E21C27/08 - with additional means for cutting the mineral into blocks

• US Classifications

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