| 1950 | Foundation of the company: Studies, Production, Maintenance |
| 1961 | Electronic measurement instrumentation for the civil industry. |
| 1962 | Studies, production and maintenance of specific energy modules . |
| 1971 | Acquisition of EFIMELEC: general mechanics. |
| 1973 | Studies, production and renovation of shelters equipped with transmission stations for the D.G.A. |
| 1974 | Maintenance of the dynamic elements of the speed ways in the Paris aera starting with theA13 followed by the A86 then theA15 for the DREIF. |
| 1984 | Acquisition of SERMS: electrical and electronic metrology. |
| 1985 | Studies, production and maintenance of computer materials. |
| 1989 | Acquisition of DATELEC: metrology, studies, production, maintenance. |
| 1991 | Integrated maintenance of the exhibition material for La Cité des Sciences et de l'Industrie in Paris. Maintenance and development of real-time data processing. |
| 1996 | Acquisition of DAMELEC: maintenance of biomedical devices and analytical instruments. |
| 2000 | Somelec joins the Livingston Group. |
| 2002 | Somelec obtains the certification according to the International standard ISO 9001: 2000 for all its activities and its locations, whether on its own premises or on those of its customers. |
| 2003 | Integration of Somelec's calibration activity within TIS-Livingston. |
| 2004 | Somelec joins Air Liquide Innovation. |