520654

Information

• Patent Grant
• 520654

• References
• Source

• Patent Number

  520,654

• Date Filed

  Not available

• Date Issued

  Tuesday, May 29, 1894
  130 years ago

• CPC

  • B23K1/18 - circumferential seams
  • E01B9/56 - for rails with two or more treads
  • Y10T29/29 - Railway-chair making

• US Classifications

  • 228 - Metal fusion bonding
  • 029 - Metal working