February the 5th, 1949: SIEMA (Industrial Society for Applied Electro-Mechanics) began its activity in design and manufacture of electrical relays.

1968: Creation of a range of railway telephony.

1994: Creation of a range of monitoring and diagnostics.

2002: Acquisition by VOSSLOH COGIFER subsidiary of Vossloh group.

2006: Commissioning on the LGV East SIAM Systems, CAPTEURS Systems, panel GSM-R and more than 1,300 PTE GSM-R, where the world record speed rail was beaten on April 3, 2007 at a speed of 574.8 km/h, will serve as reference for future LGV.

2007: Development of a range of rail-based telephony VoIP technology.

2010: Creation of range of acquisition, transmission of information and control of railway equipment.