1358767

Information

• Patent Grant
• 1358767

• References
• Source

• Patent Number

  1,358,767

• Date Filed

  Not available

• Date Issued

  Tuesday, November 16, 1920
  104 years ago

• CPC

  • E21C37/08 - Devices with pistons, plungers, or the like, pressed locally against the wall of the borehole

• US Classifications

  • 299 - Mining or in situ disintegration of hard material