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Westberliner schauen am 12. September 1961 an der Wilhelmstrasse in Berlien der Anlieferung vorgefertigter Betonbauteile zur Verstaerkung der Berliner Mauer zu. Am Donnerstag, den 13. August 2009, jaehrt sich der offizielle Tag des Mauerbaus zum 48. Mal. (AP Photo/Eddie Worth) * NUR S/W * --- In this Sept. 12, 1961 file photo West Berliners, with their backs to camera, watch East Berliners unload prefabricated concrete plates to reinforce the Berlin Wall at Wilhelm Strasse in Berlin, Germany on Sept. 12, 1961. The sector border is being reinforced with roadblocks on every street leading into West Berlin in order to prevent further escapes by trucks. Berlin on Wednesday, Aug. 13, 2008 sees the 47th anniversary of the beginning of the erection of the so-called Berlin Wall. (AP Photo/Eddie Worth) ** B/W ONLY **