Schreiber & Keilwerth Musikinstrumente GmbH, a firm manufacturing saxophones are based in Nauheim as of 2010.

Eventually, D&J started to manufacture their own complete saxophones (without any Keilwerth involvement) before supplying them directly to German musical instrument retailers as well as the export market.

Saxophones manufactured by Dörfler & Jörka for distribution direct to retailers featured their own key mechanisms which were very closely modelled on Keilwerth designs, though not completely identical.

The majority of D&J saxophones were engraved with numerous different labels[5][6] including (but not limited to) the following:- Due to issues of intellectual property infringement, brand recognition and consequential loss of revenue, the Keilwerth company became increasingly aggrieved that Dörfler & Jörka were successfully copying their saxophones, which was amplified by the fact that both companies were based in the same town and had previously enjoyed a mutually beneficial business relationship.

Dörfler & Jörka were subsequently absorbed into the Keilwerth company and production of all D&J saxophones ended by 1968.