1440790

Information

• Patent Grant
• 1440790

• References
• Source

• Patent Number

  1,440,790

• Date Filed

  Not available

• Date Issued

  Tuesday, January 2, 1923
  102 years ago

• CPC

  • E21C27/06 - with a slewing frame
  • B27B33/144 - having cutting inserts or exchangeable cutting teeth

• US Classifications

  • 299 - Mining or in situ disintegration of hard material