3922017

Information

• Patent Grant
• 3922017

• References
• Source

• Patent Number

  3,922,017

• Date Filed

  Not available

• Date Issued

  Tuesday, November 25, 1975
  49 years ago

• CPC

  • E02F3/966 - of hammer-type tools
  • E21C27/28 - by percussive drills with breaking-down means

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 037 - Excavating
  • 173 - Tool driving or impacting