1969811

Information

• Patent Grant
• 1969811

• References
• Source

• Patent Number

  1,969,811

• Date Filed

  Not available

• Date Issued

  Tuesday, August 14, 1934
  90 years ago

• CPC

  • E21D11/04 - Lining with building materials
  • E21D5/04 - with brick, concrete, stone, or similar building materials

• US Classifications

  • 405 - Hydraulic and earth engineering