SZT2992275: SS teams cordoning off, 1938 (b/w photo) / Bridgeman Images

SZT2992290: Radio wave disturbance car, 1935 (b/w photo) / Bridgeman Images

SZT2992296: Telegraph poles, 1929 (b/w photo) / Bridgeman Images

SZT2992307: Woman on the wall phone, 1934 (b/w photo) / Bridgeman Images

SZT2992319: Telephone station in Russia (b/w photo) / Bridgeman Images

SZT2992334: Charles Dawes, Aime de Fleuriau and the Ambassador of Japan at the memorial service for Stresemann (b/w photo) / Bridgeman Images

SZT2992349: Robert Bosch with Count and Countess Oudenhove and Leo Amery at the Pan-European Congress, 1930 (b/w photo) / Bridgeman Images

SZT2992388: Scene from: 'Berlin: Symphony of a Metropolis' (1927) (b/w photo) / Bridgeman Images

SZT2992421: Postman before Doorn Manor, 1929 (b/w photo) / Bridgeman Images

SZT2992424: Postman, around 1900 (b/w photo) / Bridgeman Images

SZT2992433: Street telephone for police officers in Paris, 1932 (b/w photo) / Bridgeman Images

SZT2992445: Friedrich Ebert and his wife in the summer resort, 1919 (b/w photo) / Bridgeman Images

SZT2992478: Arthur Seyss-Inquart, 1938 (b/w photo) / Bridgeman Images

SZT2992496: General Erich von Falkenhayn (b/w photo) / Bridgeman Images

SZT2992499: Erich von Falkenhayn, 1913 (b/w photo) / Bridgeman Images

SZT2992505: Queen Mary of Romania and Frank B. Kellogg, 1926 (b/w photo) / Bridgeman Images

SZT2992511: Frank B. Kellogg signs the Kellogg-Briand Pact, 1928 (b/w photo) / Bridgeman Images

SZT2992544: Eduard Tiss, Douglas Fairbanks and Sergei Eisenstein, 1926 (b/w photo) / Bridgeman Images

SZT2992547: Sergei Eisenstein and cameraman Eduard Tisse during the shooting of 'Die Generallinie' (b/w photo) / Bridgeman Images

SZT2992583: Post agency in a colonial store, 1929 (b/w photo) / Bridgeman Images

SZT2992586: Post office in Berlin, 1936 (b/w photo) / Bridgeman Images

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