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Application filed by Nederlanden StaatfiledCriticalNederlanden Staat
Application grantedgrantedCritical
Publication of DK77960CpublicationCriticalpatent/DK77960C/en
DK500447A1945-09-031947-12-29
Coupling to subscriber class marking at signaling systems, in particular telephone systems or telegraph systems.
DK77960C
(en)