ADB

Started in 1920 by Adrien de Backer (ADB) in Belgium, manufacturing electrical equipment for laboratories, mainly resistances (known as rheostats) to limit and vary electrical current. 
In 1938, ADB began a range of spotlights. 
1950 brought innovations including dimmers based on Thyratrons, and magnetic amplifers.
1965 Thyristor-based dimmers introduced.
1985 Microprocessor-based memory lighting controls introduced. 
In 1987, ADB was acquired by Siemens.
In 2016, ADB was aquired by Clay Paky, which in turn is part of the Osram group. 

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