AVA Radio Company The AVA Radio Company ( Polish : " Wytwórnia Radiotechniczna AVA " ) was a Polish electronics firm founded in 1929 in Warsaw , Poland . AVA designed and built radio equipment for the Polish General Staff ' s Cipher Bureau , which was responsible for the radio communications of the General Staff ' s " Oddział II " ( Section II , the General Staff ' s intelligence section ) . After the Cipher Bureau ' s mathematician - cryptologist Marian Rejewski in late December 1932 deduced the wiring in the German military Enigma rotor cipher machine , AVA built Enigma " doubles " as well as all the electro - mechanical equipment designed at the Cipher Bureau to expedite decryption of Enigma ciphers . History . AVA ' s four directors were Edward Fokczyński , Antoni Palluth , Ludomir Danilewicz , and his younger brother Leonard Danilewicz . The company took its name from the combined radio callsign s of the Danilewicz brothers ( " TPAV " ) and Palluth ( " TPVA " ) . When the company was being formed in 1929 , the Danilewicz brothers were short - wave " ham s " and students at the Warsaw Polytechnic . In 1927 , Fokczyński had opened a small radio workshop on Warsaw ' s New World Street . Sporadically he had received orders from the Cipher Bureau , whose Captain Maksymilian Ciężki knew Fokczyński from his 1919 – 22 army service . Beginning in 1929 , the modest shop , ten minutes ' walk from the General Staff building , which housed the Cipher Bureau , was transformed into AVA . The company subsequently moved to new facilities in southern Warsaw ' s Mokotów district . Early on , the fledgling company was severely under - capitalized . All four directors , however , had other jobs ; and soon the Cipher Bureau came to the rescue with an order for eight 10 - watt short - wave radio stations , which became the embryo of Section II ' s radio network . 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 . The General Staff ' s Cipher Bureau was responsible for the radio communications of the General Staff ' s Section II ( Intelligence section ) . The Cipher Bureau entrusted the design and construction of the equipment to AVA . The work was carried out on a cost - plus basis , to the benefit of both AVA and the General Staff . In December 1932 , the Cipher Bureau ' s mathematician - cryptologist Marian Rejewski reconstructed the wiring of the German Enigma machine . The Poles ' subsequent reading of German cipher s laid the foundation for the western Allies ' Ultra cipher - breaking operations , beginning seven years later , during World War II . Now , in January 1933 , just as Hitler was coming to power in Germany , AVA quickly produced a " double " of the Enigma machine ; by mid - 1934 , it had made over a dozen . In 1934 or 1935 , AVA built the cyclometer , a device designed by Rejewski to prepare a " card catalog " that facilitated the decryption of Enigma messages . In 1938 AVA built the " cryptologic bomb , " invented by Rejewski about October 1938 . This was an electrically powered aggregate of six Enigmas that took the place of some one hundred workers . Six bombs were built before September 1939 . Actual assembly of the cyclometers , " bombs " and LCD cipher machines was carried out not at the AVA facilities but in Room 13 ( the " Clock Room " ) at the Cipher Bureau in the General Staff building — and , from 1937 , at the new Cipher Bureau center in the Kabaty Woods south of Warsaw . No one had access to this room except the head of the Cipher Bureau , Gwido Langer , the head of its German section ( " B . S . 4 " ) , Maksymilian Ciężki , and personnel employed there : Antoni Palluth , Ludomir Danilewicz , his younger brother Leonard , Edward Fokczyński , and the specialist in precision mechanics , Czesław Betlewski .