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Application filed by Underingenioer Thorval NielsenfiledCriticalUnderingenioer Thorval Nielsen
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DK38708D1926-03-311926-03-31Fremgangsmaade og Anordning til ved Signalering gennem Telegrafkredsløb samtidig at overføre to Depecher i samme Retning.
DK38708C
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