2855188

Information

• Patent Grant
• 2855188

• References
• Source

• Patent Number

  2,855,188

• Date Filed

  Not available

• Date Issued

  Tuesday, October 7, 1958
  66 years ago

• CPC

  • E21D3/00 - Raising shafts

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 182 - Fire escape, ladder, or scaffold