GB1229949A - - Google Patents

Info

Publication number
GB1229949A
GB1229949A GB1229949DA GB1229949A GB 1229949 A GB1229949 A GB 1229949A GB 1229949D A GB1229949D A GB 1229949DA GB 1229949 A GB1229949 A GB 1229949A
Authority
GB
United Kingdom
Prior art keywords
advancing
clevises
conveyor
rams
rail
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
Other languages
English (en)
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
Application filed filed Critical
Publication of GB1229949A publication Critical patent/GB1229949A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices

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)
  • Excavating Of Shafts Or Tunnels (AREA)
GB1229949D 1968-11-26 1968-11-26 Expired GB1229949A (enExample)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5594368 1968-11-26

Publications (1)

Publication Number Publication Date
GB1229949A true GB1229949A (enExample) 1971-04-28

Family

ID=10475285

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1229949D Expired GB1229949A (enExample) 1968-11-26 1968-11-26

Country Status (1)

Country Link
GB (1) GB1229949A (enExample)

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GB1229949A (enExample)
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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees