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Keywords: Gottlob Frege (Emil Tesch).png Friedrich Ludwig Gottlob Frege 1848-1925 m DE mathematician philosopher The Open court vol 30 1916 p 614<br />http //books google com/books id mPgaAAAAYAAJ pg PA614 Emil Tesch 1860-1931 m DE photographer ~ 1905 many years before 1916 1931 The photograph was given to Philip Jourdain born 1879 many years ago by Professor Frege http //books google com/books id mPgaAAAAYAAJ pg PA616 see p 616 of the source Gottlob Frege Emil Tesch |