2774407

Information

• Patent Grant
• 2774407

• References
• Source

• Patent Number

  2,774,407

• Date Filed

  Not available

• Date Issued

  Tuesday, December 18, 1956
  68 years ago

• CPC

  • G04D3/0041 - for coil-springs
  • B21F3/08 - to flat spiral

• US Classifications

  • 072 - Metal deforming
  • 267 - Spring devices
  • 968 - Horology