BE708882A - - Google Patents

Info

Publication number
BE708882A
BE708882A BE708882DA BE708882A BE 708882 A BE708882 A BE 708882A BE 708882D A BE708882D A BE 708882DA BE 708882 A BE708882 A BE 708882A
Authority
BE
Belgium
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.)
Filing date
Publication date
Priority claimed from PL118299A external-priority patent/PL56867B1/pl
Application filed filed Critical
Publication of BE708882A publication Critical patent/BE708882A/xx

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C27/00Machines which completely free the mineral from the seam
    • E21C27/01Machines which completely free the mineral from the seam specially adapted for removing overhanging coal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/04Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/06Special mine caps or special tops of pit-props for permitting step-by-step movement
    • E21D23/063Retractable cantilever extensions therefor
BE708882D 1967-01-02 1968-01-02 BE708882A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL118299A PL56867B1 (de) 1967-01-02

Publications (1)

Publication Number Publication Date
BE708882A true BE708882A (de) 1968-05-16

Family

ID=19949590

Family Applications (1)

Application Number Title Priority Date Filing Date
BE708882D BE708882A (de) 1967-01-02 1968-01-02

Country Status (2)

Country Link
BE (1) BE708882A (de)
FR (1) FR1549904A (de)

Also Published As

Publication number Publication date
FR1549904A (de) 1968-12-13

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