Another business that was essential for the future economic development of Erlangen was the workshop of the university mechanic Erwin Moritz Reiniger, in which he manufactured optical and precision mechanical devices from 1876. In 1886, this became the Reiniger, Gebbert & Schall company, which was already cooperating successfully with the medical faculty of the university. After the development of the X-ray machine in 1895 by Wilhelm Röntgen in Würzburg, Reiniger immediately contacted the company and agreed to manufacture X-ray equipment in his Erlangen factory. In 1925 Siemens & Halske AG acquired the company and incorporated its own department for medical technology. Before the Second World War, more than 2000 employees were already working at the Erlangen location of Siemens-Reiniger-Werke, whose central administration had already been relocated from Berlin to Erlangen in 1943. From 1947 onwards, the city was also the headquarters of the company from which today's Siemens Healthineers Sector of Siemens AG emerged.
