1921 - SEISMOS GmbH founded by Dr. Ludger Mintrop in Dortmund;
1937 - Die Gesellschaft für praktische Lagerstättenforschung GmbH , (the Society for practical deposit research) later known as PRAKLA, qas founded 23 March in Berlin
1963 - Prakla and Seismos combine to form Prakla-Seismos
1972 - PRAKLA-SEISMOS Geomechanics GmbH
1985 - GmbH transformed into a corporation and a planned IPO
1991 - re-converted into a limited company and was sold to Schlumberger Limited and broken up. SEISMOS was immediately abandoned. PRAKLA existed as GECO PRAKLA for some time.