3289997

Information

• Patent Grant
• 3289997

• References
• Source

• Patent Number

  3,289,997

• Date Filed

  Not available

• Date Issued

  Tuesday, December 6, 1966
  58 years ago

• CPC

  • E21D15/54 - Details of the ends of props
  • E21D23/0047 - without essential shifting devices
  • E21D23/049 - Connecting devices between the head or foot of a prop and the cap or base of the roof support

• US Classifications

  • 248 - Supports
  • 405 - Hydraulic and earth engineering