1878036

Information

• Patent Grant
• 1878036

• References
• Source

• Patent Number

  1,878,036

• Date Filed

  Not available

• Date Issued

  Tuesday, September 20, 1932
  92 years ago

• CPC

  • E21C25/66 - Machines for making slits with additional arrangements for drilling

• US Classifications

  • 173 - Tool driving or impacting
  • 175 - Boring or penetrating the earth