In the end of the thirties Max E. Russenberger had his first contact with materials testing technology. All areas of technology fascinated the young engineer, so that it was not surprising that he was successful in many developments with unconventional ideas. Later he became senior chief engineer at the testing machine company Alfred J. Amsler & Co., where he designed the first resonant testing technology which earned him worldwide tribute. In 1964 Max E. Russenberger founded his own business. His particular aim in the new company was to design and build dynamic materials testing systems. The main product line was the high frequency resonant pulsator or, in other words, resonant testing machines. In a later stage Erwin Müller, also a former Amsler employee, joined the company as a partner. RUMUL is the result of an abbreviation of these two names. With his exceptionally creative talent the company’s founder developed an entirely new concept; the resonsant testing machine.