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Application filed by Philips NvfiledCriticalPhilips Nv
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Publication of DK44890CpublicationCriticalpatent/DK44890C/da
DK44890D1929-05-181930-04-03Apparat, indeholdende et elektrisk Udladningsrør, til Modtagelse eller Forstærkning af elektriske Svingninger.
DK44890C
(da)