3600923

Information

• Patent Grant
• 3600923

• References
• Source

• Patent Number

  3,600,923

• Date Filed

  Not available

• Date Issued

  Tuesday, August 24, 1971
  53 years ago

• CPC

  • B21F3/06 - internally on a hollow form
  • B21F3/04 - externally on a mandrel or the like
  • B21F35/00 - Making springs from wire
  • G04D3/0007 - for springs
  • G04D3/0041 - for coil-springs

• US Classifications

  • 072 - Metal deforming
  • 140 - Wireworking
  • 968 - Horology