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Note from other hand: Missionary A. Mannfeld, Baubruder, died in Zurich where he was a preacher

Preface: Karl Mey * 16 March 1879 in Wandersleben near Gotha, Thuringia; † unknown, after May 1945 Mey studied mathematics and physics at the Humboldt University Berlin. He received his doctorate in 1902 with his work "On the cathode gradient of alkali metals". After completing his studies, Mey worked at the Tegel Military Experimental Station and then at the General Electricity Company (AEG), where he specialized in the improvement of incandescent lamps. In 1909 he became the head of the AEG bulb factory. During the First World War, Mey served in the infantry on the Western Front from 1914 to 1917. After the war, Mey resumed his employment at AEG and, following the spin-off of the light bulb production of AEG, Deutsche Gasglühlicht AG (Auergesellschaft) and Siemens

Correspondence, 1832-1846 1905-1938; Statuten, 1832; Extrablatt zu Nr. 35 des Weißenfelser Kreisblattes, with Statuten, Dr., August 1833; Statungen, 1905 1932; Liste d. Missionsarbeiterinnen aus Thüringen, ca. 1931