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Application filed by J BertagnifiledCriticalJ Bertagni
Priority to ZA711695ApriorityCriticalpatent/ZA711695B/en
Publication of ZA711695BpublicationCriticalpatent/ZA711695B/en
ZA711695A1971-03-151971-03-15Flat diaphragm for sound transducers and method for manufacturing it and a loudspeaker including said flat diaphragm
ZA711695B
(en)