2137821

Information

• Patent Grant
• 2137821

• References
• Source

• Patent Number

  2,137,821

• Date Filed

  Not available

• Date Issued

  Tuesday, November 22, 1938
  86 years ago

• CPC

  • B24B5/225 - for mass articles

• US Classifications

  • 451 - Abrading
  • 125 - Stone working