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Application filed by Philips NvfiledCriticalPhilips Nv
Publication of BE531694ApublicationCriticalpatent/BE531694A/en
BE531694A1953-09-091954-09-07
COMBINATION OF LOUDSPEAKERS CONSISTING OF ONE LOUDSPEAKER FOR LOW NOTES AND MULTIPLE LOUDSPEAKERS FOR HIGH NOTES.
BE531694A
(en)