As head of the scientific-technical bureau, he was in charge of coordinating and pushing scientific work in the field of light bulbs of the three founding companies Siemens & Halske, AEG and the Auergesellschaft.
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In 1904, he joins the light bulb factory (Glühlampenwerk) of Siemens & Halske AG in Berlin where he remained for the next fifteen years.
Marcello Pirani (1880–1968) the German physicist and inventor of the Pirani vacuum gauge
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