3391561

Information

• Patent Grant
• 3391561

• References
• Source

• Patent Number

  3,391,561

• Date Filed

  Not available

• Date Issued

  Tuesday, July 9, 1968
  56 years ago

• CPC

  • B21B17/08 - with mandrel having one or more protrusions

• US Classifications

  • 072 - Metal deforming