2689117

Information

• Patent Grant
• 2689117

• References
• Source

• Patent Number

  2,689,117

• Date Filed

  Not available

• Date Issued

  Tuesday, September 14, 1954
  70 years ago

• CPC

  • E21C27/16 - with means for both slitting and breaking-down

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 175 - Boring or penetrating the earth
  • 475 - Planetary gear transmission systems or components
  • 492 - Roll or roller