2273389

Information

• Patent Grant
• 2273389

• References
• Source

• Patent Number

  2,273,389

• Date Filed

  Not available

• Date Issued

  Tuesday, February 17, 1942
  83 years ago

• CPC

  • E21D15/285 - by means of wedges or wedge combinations

• US Classifications

  • 248 - Supports