80309

Information

• Patent Grant
• 80309

• References
• Source

• Patent Number

  80,309

• Date Filed

  Not available

• Date Issued

  Tuesday, July 28, 1868
  156 years ago

• CPC

  • E21C49/02 - by excavating

• US Classifications

  • 037 - Excavating
  • 299 - Mining or in situ disintegration of hard material