2872147

Information

• Patent Grant
• 2872147

• References
• Source

• Patent Number

  2,872,147

• Date Filed

  Not available

• Date Issued

  Tuesday, February 3, 1959
  65 years ago

• CPC

  • E21D15/44 - Hydraulic, pneumatic, or hydraulic-pneumatic props
  • E21D15/587 - by means of power accumulators to be pre-charged by rock pressure

• US Classifications

  • 248 - Supports