3474627

Information

• Patent Grant
• 3474627

• References
• Source

• Patent Number

  3,474,627

• Date Filed

  Not available

• Date Issued

  Tuesday, October 28, 1969
  55 years ago

• CPC

  • E21D23/0454 - Trailing plates; Coal face or goaf side sprags

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 248 - Supports