3141521

Information

• Patent Grant
• 3141521

• References
• Source

• Patent Number

  3,141,521

• Date Filed

  Not available

• Date Issued

  Tuesday, July 21, 1964
  60 years ago

• CPC

  • E21D3/00 - Raising shafts

• US Classifications

  • 182 - Fire escape, ladder, or scaffold
  • 187 - Elevator, industrial lift truck, or stationary lift for vehicle