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Application filed by Thorvald Christian Val NielsenfiledCriticalThorvald Christian Val Nielsen
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Publication of DK45735CpublicationCriticalpatent/DK45735C/da
DK45735D1930-05-281930-05-28Fremgangsmaade ved Telegrafering til automatisk Opretning af modtagne Signaler og Apparat til Fremgangsmaadens Udførelse.
DK45735C
(da)