3442554

Information

• Patent Grant
• 3442554

• References
• Source

• Patent Number

  3,442,554

• Date Filed

  Not available

• Date Issued

  Tuesday, May 6, 1969
  55 years ago

• CPC

  • E21D9/1033 - by a transversely extending boom being pivotable about a longitudinal axis
  • E21D9/1086 - Drives or transmissions specially adapted therefor

• US Classifications

  • 299 - Mining or in situ disintegration of hard material