2986856

Information

• Patent Grant
• 2986856

• References
• Source

• Patent Number

  2,986,856

• Date Filed

  Not available

• Date Issued

  Tuesday, June 6, 1961
  63 years ago

• CPC

  • B23F19/057 - by making use of a tool in the shape of an internal gear

• US Classifications

  • 451 - Abrading