1478281

Information

• Patent Grant
• 1478281

• References
• Source

• Patent Number

  1,478,281

• Date Filed

  Not available

• Date Issued

  Tuesday, December 18, 1923
  100 years ago

• CPC

  • E21C27/04 - by a single chain guided on a frame with or without auxiliary slitting means

• US Classifications

  • 299 - Mining or in situ disintegration of hard material