1820518

Information

• Patent Grant
• 1820518

• References
• Source

• Patent Number

  1,820,518

• Date Filed

  Not available

• Date Issued

  Tuesday, August 25, 1931
  93 years ago

• CPC

  • B23P15/005 - keys
  • Y10T29/442 - of key article

• US Classifications

  • 029 - Metal working