2577924

Information

• Patent Grant
• 2577924

• References
• Source

• Patent Number

  2,577,924

• Date Filed

  Not available

• Date Issued

  Tuesday, December 11, 1951
  73 years ago

• CPC

  • E21C27/42 - combined with scraper or collector box
  • E21D9/01 - Methods or apparatus for enlarging or restoring the cross-section of tunnels

• US Classifications

  • 299 - Mining or in situ disintegration of hard material