1351892

Information

• Patent Grant
• 1351892

• References
• Source

• Patent Number

  1,351,892

• Date Filed

  Not available

• Date Issued

  Tuesday, September 7, 1920
  104 years ago

• CPC

  • E21C25/34 - Chains
  • B28D1/125 - with exchangeable cutter bits or cutter segments

• US Classifications

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