1860946

Information

• Patent Grant
• 1860946

• References
• Source

• Patent Number

  1,860,946

• Date Filed

  Not available

• Date Issued

  Tuesday, May 31, 1932
  92 years ago

• CPC

  • E21C1/10 - with a built-in feeding device

• US Classifications

  • 173 - Tool driving or impacting
  • 091 - Motors: expansible chamber type