1328755

Information

• Patent Grant
• 1328755

• References
• Source

• Patent Number

  1,328,755

• Date Filed

  Not available

• Date Issued

  Tuesday, January 20, 1920
  104 years ago

• CPC

  • E21C25/24 - with flat jibs only
  • E21C29/06 - anchored at one or both ends to the mine working face

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 254 - Implements or apparatus for applying pushing or pulling force