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

    • 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)
NL77995D 1951-03-07 NL77995C (enrdf_load_html_response)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
NL77995C true NL77995C (enrdf_load_html_response)

Family

ID=19812159

Family Applications (1)

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

Country Status (4)

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

Also Published As

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

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