SZT2992291: Post office of wireless telegraphy, 1911 (b/w photo) / Bridgeman Images

SZT2992294: Telegraph station, 1919 (b/w photo) / Bridgeman Images

SZT2992300: Blinds at the telephone exchange, 1918 (b/w photo) / Bridgeman Images

SZT2992324: SA and SS men in Bad Harzburg, 1931 (b/w photo) / Bridgeman Images

SZT2992327: Prince Henry of Prussia and Theodore Roosevelt at the baptism of the imperial yacht 'Meteor', 1902 (b/w photo) / Bridgeman Images

SZT2992354: Telephone booth in Berlin, 1935 (b/w photo) / Bridgeman Images

SZT2992408: Telephone operators in the central office Chemnitz, 1905 (b/w photo) / Bridgeman Images

SZT2992423: Customers in a post office (b/w photo) / Bridgeman Images

SZT2992435: Telephonist in the 1930s (b/w photo) / Bridgeman Images

SZT2992459: Government troops in the Kleiner Tiergarten, 1919 (b/w photo) / Bridgeman Images

SZT2992468: Wilhelm II and August von Mackensen (b/w photo) / Bridgeman Images

SZT2992477: August von Mackensen in Hussar uniform, 1929 (b/w photo) / Bridgeman Images

SZT2992483: August von Mackensen in a Hussar's Uniform in the 1920s (b/w photo) / Bridgeman Images

SZT2992486: Prince Wilhelm of Prussia and August von Mackensen, 1913 (b/w photo) / Bridgeman Images

SZT2992510: President Calvin Coolidge and his cabinet, 1929 (b/w photo) / Bridgeman Images

SZT2992519: Air mail transport with Lufthansa, 1936 (b/w photo) / Bridgeman Images

SZT2992534: German soldiers dig for telephone cables, 1914 (b/w photo) / Bridgeman Images

SZT2992546: Sergei Michailovich Eisenstein, 1930 (b/w photo) / Bridgeman Images

SZT2992576: Image telegraphs station, 1930 (b/w photo) / Bridgeman Images

SZT2992347: Robert Bosch with a company manager, 1940 (b/w photo) / Bridgeman Images

SZT2992350: Robert Bosch (b/w photo) / Bridgeman Images

SZT2992371: Admission of Germany into the League of Nations, 1926 (b/w photo) / Bridgeman Images

SZT2992386: Scene from: 'Berlin: Symphony of a Metropolis' (1927) (b/w photo) / Bridgeman Images

SZT2992413: Telephone exchange in Berlin, 1910 (b/w photo) / Bridgeman Images

SZT2992443: Desk telephone, 1929 (b/w photo) / Bridgeman Images

SZT2992455: Government troops in the fight against Spartacists, 1919 (b/w photo) / Bridgeman Images

SZT2992482: August von Mackensen in Szekesfehervar, 1935 (b/w photo) / Bridgeman Images

SZT2992500: Archduke Friedrich, Erich von Falkenhayn and Hermann von Staab, 1917 (b/w photo) / Bridgeman Images

SZT2992503: Archduke Friedrich, Lieutenant-General von Morgen and General Erich von Falkenhayn, 1917 (b/w photo) / Bridgeman Images

SZT2992536: Friedrich Wilhelm Murnau and Gosta Ekman during the shooting of 'Faust', 1925/26 (b/w photo) / Bridgeman Images

SZT2992545: Sergei Eisenstein at the shooting, 1933 (b/w photo) / Bridgeman Images

SZT2992572: Car call terminal in Potsdam, 1926 (b/w photo) / Bridgeman Images

SZT2992581: Image telegraphs station, 1930 (b/w photo) / Bridgeman Images

SZT2992604: Goethe House in Frankfurt am Main, 1934 (b/w photo) / Bridgeman Images

SZT2992610: Program sheet for the premiere of 'Goetz von Berlichingen' (b/w photo) / Bridgeman Images

SZT2992613: House of Charlotte von Stein in Weimar. (b/w photo) / Bridgeman Images