1847 - Founded by Werner Siemens (1816-1892) with his brother, Johann George Halske as Siemens & Halske Telegraph Construction Company in Berlin;

1890 - Werner von Siemens hands the company over to his brother, Carl, and his sons, Arnold and Wilhelm

1897 - Siemens & Halske becomes a stock corporation as Siemens & Halske A.G. in 1897