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)
• Golf Clubs (AREA)
• Holders For Apparel And Elements Relating To Apparel (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=3879449

Family Applications (1)

Country Status (4)

• 0
  • BE BE513045D patent/BE513045A/xx unknown
  • LU LU32191D patent/LU32191A1/xx unknown
• 1953
  • 1953-05-19 FR FR1077441D patent/FR1077441A/fr not_active Expired
  • 1953-06-12 GB GB16238/53A patent/GB742741A/en not_active Expired

Also Published As

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