235721

Information

• Patent Grant
• 235721

• References
• Source

• Patent Number

  235,721

• Date Filed

  Not available

• Date Issued

  Tuesday, December 21, 1880
  144 years ago

• CPC

  • B24D3/24 - for close-grained structure

• US Classifications

  • 051 - Abrasive tool making process, material, or composition