Classifications

• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
  • E21D17/00—Caps for supporting mine roofs
  • E21D17/02—Cantilever extension or similar protecting devices
  • E21D17/08—Cap joints for obtaining a coal-face free of pit-props
  • E21D17/086—Cap joints for obtaining a coal-face free of pit-props or articulated type

Landscapes

• Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Geology (AREA)
• Bridges Or Land Bridges (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19812159

Family Applications (1)

Country Status (4)

• 0
  • NL NL77995D patent/NL77995C/xx active
  • BE BE509687D patent/BE509687A/xx unknown
• 1952
  • 1952-03-04 FR FR1059850D patent/FR1059850A/fr not_active Expired
  • 1952-03-06 GB GB5908/52A patent/GB709243A/en not_active Expired

Also Published As

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