3906733

Information

• Patent Grant
• 3906733

• References
• Source

• Patent Number

  3,906,733

• Date Filed

  Not available

• Date Issued

  Tuesday, September 23, 1975
  49 years ago

• CPC

  • E21D23/03 - having protective means
  • E21F5/04 - Spraying barriers

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 299 - Mining or in situ disintegration of hard material