The German company JAHNS is registered in the Offenbach Commercial Register as a factory specializing in the manufacture of various power machine regulators. The company was founded by engineer Wilhelm Jahns (who built Class I controllers based on his patents), businessman Carl Seidel, and several other silent partners. The company has been a Dapp/Sauerwein owned limited company since 1928. Since then, the company has produced axial piston pumps for presses and steering gear, as well as water turbine regulators.