1997093

Information

• Patent Grant
• 1997093

• References
• Source

• Patent Number

  1,997,093

• Date Filed

  Not available

• Date Issued

  Tuesday, April 9, 1935
  89 years ago

• CPC

  • E21C25/50 - with equipment for cleaning the slit

• US Classifications

  • 299 - Mining or in situ disintegration of hard material