3445137

Information

• Patent Grant
• 3445137

• References
• Source

• Patent Number

  3,445,137

• Date Filed

  Not available

• Date Issued

  Tuesday, May 20, 1969
  55 years ago

• CPC

  • E21D9/116 - by means of non-concentric rotary heads
  • E21D9/1093 - Devices for supporting, advancing or orientating the machine or the tool-carrier
  • E21D9/117 - mounted for orientating or sideways shifting relative to the frame

• US Classifications

  • 299 - Mining or in situ disintegration of hard material