1394718

Information

• Patent Grant
• 1394718

• References
• Source

• Patent Number

  1,394,718

• Date Filed

  Not available

• Date Issued

  Tuesday, October 25, 1921
  103 years ago

• CPC

  • E21D1/16 - by petrification
  • E02D19/16 - by placing or applying sealing substances

• US Classifications

  • 405 - Hydraulic and earth engineering