TREA

Brackets for roof-supporting bars

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Industry

  • CPC
  • E21D17/03
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D17/00Caps for supporting mine roofs

Current Industry

E21D17/03Brackets for roof-supporting bars
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    2608370
    • Patent number 2,608,370
    • Issue date Aug 26, 1952
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents