TREA

by a single chain guided on a frame with or without auxiliary slitting means

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Industry

  • CPC
  • E21C27/04
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21CMINING OR QUARRYING E21C27/00Machines which completely free the mineral from the seam

Current Industry

E21C27/04by a single chain guided on a frame with or without auxiliary slitting means
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    2753169
    • Patent number 2,753,169
    • Issue date Jul 3, 1956
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2730346
    • Patent number 2,730,346
    • Issue date Jan 10, 1956
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2684236
    • Patent number 2,684,236
    • Issue date Jul 20, 1954
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2384447
    • Patent number 2,384,447
    • Issue date Sep 11, 1945
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2305298
    • Patent number 2,305,298
    • Issue date Dec 15, 1942
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2292098
    • Patent number 2,292,098
    • Issue date Aug 4, 1942
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2276731
    • Patent number 2,276,731
    • Issue date Mar 17, 1942
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2276730
    • Patent number 2,276,730
    • Issue date Mar 17, 1942
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2189670
    • Patent number 2,189,670
    • Issue date Feb 6, 1940
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2093448
    • Patent number 2,093,448
    • Issue date Sep 21, 1937
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1677399
    • Patent number 1,677,399
    • Issue date Jul 17, 1928
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1522693
    • Patent number 1,522,693
    • Issue date Jan 13, 1925
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1507421
    • Patent number 1,507,421
    • Issue date Sep 2, 1924
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1497692
    • Patent number 1,497,692
    • Issue date Jun 17, 1924
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1478281
    • Patent number 1,478,281
    • Issue date Dec 18, 1923
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents