2271731

Information

• Patent Grant
• 2271731

• References
• Source

• Patent Number

  2,271,731

• Date Filed

  Not available

• Date Issued

  Tuesday, February 3, 1942
  82 years ago

• CPC

  • B21F37/04 - of washers
  • B21F37/02 - of resilient rings

• US Classifications

  • 470 - Threaded, headed fastener, or washer making: process and apparatus