From service engineering provider to full scope design, engineering and execution of complete compressor systems. The article retraces the history of CST, from its origin, when the company was initially composed of just four people and worked as a service engineering provider mainly to Nuovo Pignone (now GE Oil & Gas) for reciprocating compressors, to today, when, in the span of 15 years, CST has transformed into an international player for critical machine applications in the Oil & Gas and other industrial sectors.