2457631

Information

• Patent Grant
• 2457631

• References
• Source

• Patent Number

  2,457,631

• Date Filed

  Not available

• Date Issued

  Tuesday, December 28, 1948
  76 years ago

• CPC

  • G04D3/0041 - for coil-springs
  • Y10T29/49609 - Spring making

• US Classifications

  • 432 - Heating
  • 029 - Metal working
  • 968 - Horology