339421

Information

• Patent Grant
• 339421

• References
• Source

• Patent Number

  339,421

• Date Filed

  Not available

• Date Issued

  Tuesday, April 6, 1886
  139 years ago

• CPC

  • B24B3/242 - of step drills

• US Classifications

  • 451 - Abrading
  • 185 - Motors: spring, weight, or animal powered