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the Philips Ultrasol was the first mercury vapour arc discharge sunlamp from the N.V. Philips Gloeilampenfabrieken, Eindhoven, The Netherlands
1930
Philips Ultrasol, the first mercury vapour arc
discharge sunlamp from the N.V. Philips
Gloeilampenfabrieken, Eindhoven, The Netherlands.
building