 In 1911/1912 the J. M. Schweighofer's Söhne company was sold to the piano dealer Bernhard Kohn and his associate Friedrich Karbach, a musician and composer, presumed to be a former employee of Schweighofer.Later they were joined by dr. Oskar Karbach.Around the same time, a presumed descendant of the Schweighofer family opened a parallel factory (Johann Michael Schweighofer GmbH) and built pianos under the Schweighofer name, which led to legal complications.