TREA

Machines propelled by thrust or pull against a part alternately anchored to and released from a cable or chain

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Industry

  • CPC
  • E21C29/12
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21CMINING OR QUARRYING E21C29/00Propulsion of machines for slitting or completely freeing the mineral from the seam

Current Industry

E21C29/12Machines propelled by thrust or pull against a part alternately anchored to and released from a cable or chain
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Advancing system for coal winning machine
    • Patent number 4,768,835
    • Issue date Sep 6, 1988
    • Gosudarstvenny Proektnokonstruktorsky I Experimentalny Institut Ugolnogo Mash...
    • Boris B. Kalantarov
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Device for effecting translational movement of a machine
    • Patent number 3,990,349
    • Issue date Nov 9, 1976
    • Charbonnages de France
    • Alfred A. M. Valantin
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    2581052
    • Patent number 2,581,052
    • Issue date Jan 1, 1952
    • B66 - HOISTING LIFTING HAULING

Patents Applicationslast 30 patents