NL77995C - - Google Patents

Info

Publication number
NL77995C
NL77995C NL77995DA NL77995C NL 77995 C NL77995 C NL 77995C NL 77995D A NL77995D A NL 77995DA NL 77995 C NL77995 C NL 77995C
Authority
NL
Netherlands
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of NL77995C publication Critical patent/NL77995C/xx

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00Caps for supporting mine roofs
    • E21D17/02Cantilever extension or similar protecting devices
    • E21D17/08Cap joints for obtaining a coal-face free of pit-props
    • E21D17/086Cap 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)
NL77995D 1951-03-07 NL77995C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL709243X 1951-03-07

Publications (1)

Publication Number Publication Date
NL77995C true NL77995C (en)

Family

ID=19812159

Family Applications (1)

Application Number Title Priority Date Filing Date
NL77995D NL77995C (en) 1951-03-07

Country Status (4)

Country Link
BE (1) BE509687A (en)
FR (1) FR1059850A (en)
GB (1) GB709243A (en)
NL (1) NL77995C (en)

Also Published As

Publication number Publication date
GB709243A (en) 1954-05-19
FR1059850A (en) 1954-03-29
BE509687A (en)

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