The search for investors for parts of the insolvent Ziegler Group, based in Plößberg in the Tirschenreuth district, is apparently close to the first conclusions. This is evident from an internal letter from the provisional insolvency administrator Volker Böhm to employees, which is available to BR.    Insolvency administrator: Negotiations with interested parties are underway    According to the letter, negotiations with interested parties are already well advanced: the aim is to be able to sign concrete contracts in the second half of January. If neither creditors nor antitrust supervisors raise any ...