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Priority claimed from US12977Aexternal-prioritypatent/US1728879A/en
Priority claimed from US69200Aexternal-prioritypatent/US1640436A/en
Priority claimed from US69201Aexternal-prioritypatent/US1778058A/en
Priority claimed from US88161Aexternal-prioritypatent/US1774467A/en
Priority claimed from US108941Aexternal-prioritypatent/US1665883A/en
Priority claimed from GB2067926Aexternal-prioritypatent/GB279202A/en
Application grantedgrantedCritical
Publication of FR34843EpublicationCriticalpatent/FR34843E/fr
H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission