3035822

Information

• Patent Grant
• 3035822

• References
• Source

• Patent Number

  3,035,822

• Date Filed

  Not available

• Date Issued

  Tuesday, May 22, 1962
  62 years ago

• CPC

  • E21D9/116 - by means of non-concentric rotary heads

• US Classifications

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