2069830

Information

• Patent Grant
• 2069830

• References
• Source

• Patent Number

  2,069,830

• Date Filed

  Not available

• Date Issued

  Tuesday, February 9, 1937
  87 years ago

• CPC

  • E21D9/122 - Working or loading platforms
  • E21D9/006 - by making use of blasting methods

• US Classifications

  • 175 - Boring or penetrating the earth
  • 173 - Tool driving or impacting
  • 182 - Fire escape, ladder, or scaffold
  • 405 - Hydraulic and earth engineering