The company for metal products metllwarenfabrik Gemmingen GmbH? Manufactures components for electric machines, generators and power generating systems at three factories. It was founded in the year 1961. The production of pressed and pressuredie cast parts for the electric industry was started in the same year. After a short period of time, the manufacture of complete IEC standard engine types and the development of complete problem solutions for the electric motor production was started.

In 1981 a new production branch was developed: The manufacture of power generating sets, driven by petrol or diesel engines. Due to political and economical changes, and the opening of markets in Eastern Europe in the early 90s, a new company was founded in Hungary for the production of pressure-die cast parts. In 1998 the generator business was taken over from Robert Bosch GmbH and consequently the product line was again called by its original market name Eisemann. In 2006 the Geko Power Generating System Co., Ltd was founded in Shanghai, China.