3786511

Information

• Patent Grant
• 3786511

• References
• Source

• Patent Number

  3,786,511

• Date Filed

  Not available

• Date Issued

  Tuesday, January 15, 1974
  50 years ago

• CPC

  • E21F17/185 - Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence
  • E21D15/46 - with load-measuring devices with alarm devices

• US Classifications

  • 346 - Recorders