3861750

Information

• Patent Grant
• 3861750

• References
• Source

• Patent Number

  3,861,750

• Date Filed

  Not available

• Date Issued

  Tuesday, January 21, 1975
  50 years ago

• CPC

  • E21D9/1093 - Devices for supporting, advancing or orientating the machine or the tool-carrier
  • E21C35/06 - Equipment for positioning the whole machine in relation to its substructure
  • E21D9/087 - with a rotary drilling-head cutting simultaneously the whole cross-section

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 175 - Boring or penetrating the earth