Władysław Kozaczuk, Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two, edited and translated by Christopher Kasparek, Frederick, MD, University Publications of America, 1984, ISBN 0-89093-547-5.
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In 1927, Fokczyński had opened a small radio workshop on Warsaw's New World Street.
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Beginning in 1929, the modest shop, ten minutes' walk from the General Staff building, which housed the Cipher Bureau, was transformed into AVA.
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AVA also won other clients, including the Polish Navy and Professor Lugeon of the Warsaw Meteoroglogical Institute, for whom AVA built, to his design, an atmoradiograf that registered disturbances in the atmosphere; this, Leonard Danilewicz later recalled, was the unheralded beginning of radioastronomy.
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