1550088

Information

• Patent Grant
• 1550088

• References
• Source

• Patent Number

  1,550,088

• Date Filed

  Not available

• Date Issued

  Tuesday, August 18, 1925
  99 years ago

• CPC

  • E21C27/06 - with a slewing frame
  • B28D1/041 - with cylinder saws

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 175 - Boring or penetrating the earth