TREA

Gravity flow ventilation

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Industry

  • CPC
  • E21F1/18
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS E21F1/00Ventilation of mines or tunnels Distribution of ventilating currents

Current Industry

E21F1/18Gravity flow ventilation
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    3824911
    • Patent number 3,824,911
    • Issue date Jul 23, 1974
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents