3435619

Information

• Patent Grant
• 3435619

• References
• Source

• Patent Number

  3,435,619

• Date Filed

  Not available

• Date Issued

  Tuesday, April 1, 1969
  55 years ago

• CPC

  • E21D5/04 - with brick, concrete, stone, or similar building materials
  • E21D7/00 - Shaft equipment

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 052 - Static structures