1808858

Information

• Patent Grant
• 1808858

• References
• Source

• Patent Number

  1,808,858

• Date Filed

  Not available

• Date Issued

  Tuesday, June 9, 1931
  93 years ago

• CPC

  • E21C27/128 - with breaking-down members functioning on the slitting level

• US Classifications

  • 299 - Mining or in situ disintegration of hard material