TREA

Peter Marr

Follow

Person

  • Bochum, DE
People

Patents Grantslast 30 patents

  • Information Patent Grant

    Hydraulically operated mine prop with safety valve
    • Patent number 4,252,476
    • Issue date Feb 24, 1981
    • Bochumer Eisenhutte Heintzmann GmbH & Co
    • Manfred Koppers
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Walking mine support
    • Patent number 4,183,700
    • Issue date Jan 15, 1980
    • Bochumer Eisenhutte Heintzmann GmbH
    • Gerhard von Klinggraff
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Auxiliary walking mine support
    • Patent number 4,175,891
    • Issue date Nov 27, 1979
    • Bochumer Eisenhutte Heintzmann GmbH & Co
    • Gerhard von Klinggraff
    • E21 - EARTH DRILLING MINING