History

  1. Friedrich Wilhelm zur Weihen, Friedhelm Kreffter, Karl-Ulrich Rinne and Alfons Brune start the Industrieofen & Haertereizubehoer GmbH Unna (IHU).

    1993
  2. Alfons Brune leaves the company.

    1999
  3. Hendrik zur Weihen, son of the co-founder Friedrich Wilhelm zur Weihen, starts as an employee of the company.
    Start of the manufacture of shaft furnaces with compensator technology.

    2004/05
  4. Friedhelm Kreffter, Karl-Ulrich Rinne and Hendrik zur Weihen commonly lead the company as managing shareholders.

    2016
  5. Hendrik zur Weihen is the only managing shareholder after his partners have gone into retirement.

    2019