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Application filed by Hubert L E BlondfiledCriticalHubert L E Blond
Publication of BE586868ApublicationCriticalpatent/BE586868A/en
Process for the construction of underground galleries in difficult terrain, using prefabricated and assembled reinforced concrete segments, and equipment for implementing this process
Process for filling with shot, in particular a microphone capsule, apparatus for implementing this method or similar method, microphone capsule filled according to the preceding method or similar method