1674969

Information

• Patent Grant
• 1674969

• References
• Source

• Patent Number

  1,674,969

• Date Filed

  Not available

• Date Issued

  Tuesday, June 26, 1928
  96 years ago

• CPC

  • E21C27/126 - with slitting and breaking-down members situated in parallel on an intermediary level

• US Classifications

  • 299 - Mining or in situ disintegration of hard material