1992129

Information

• Patent Grant
• 1992129

• References
• Source

• Patent Number

  1,992,129

• Date Filed

  Not available

• Date Issued

  Tuesday, February 19, 1935
  90 years ago

• CPC

  • E21D9/006 - by making use of blasting methods
  • E21D9/122 - Working or loading platforms

• US Classifications

  • 299 - Mining or in situ disintegration of hard material