1643221

Information

• Patent Grant
• 1643221

• References
• Source

• Patent Number

  1,643,221

• Date Filed

  Not available

• Date Issued

  Tuesday, September 20, 1927
  97 years ago

• CPC

  • E21C25/02 - Machines slitting solely by one or more percussive tools moved through the seam

• US Classifications

  • 060 - Power plants