Ralf between 2 CEO: Plancke and de Jong |
Philips organised last Friday a very emotional farewell of Ralf Schäfer, the most famous expert on HID light sources. A big part of the lighting community
Ralf between 2 CEO: Plancke and de Jong |
Philips organised last Friday a very emotional farewell of Ralf Schäfer, the most famous expert on HID light sources. A big part of the lighting community
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