1660083

Information

• Patent Grant
• 1660083

• References
• Source

• Patent Number

  1,660,083

• Date Filed

  Not available

• Date Issued

  Tuesday, February 21, 1928
  96 years ago

• CPC

  • E21C27/06 - with a slewing frame

• US Classifications

  • 299 - Mining or in situ disintegration of hard material