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ALPHONSE FRANCOIS ERNEST FERRA
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ALPHONSE FRANCOIS ERNEST FERRA
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Application filed by ALPHONSE FRANCOIS ERNEST FERRAfiledCriticalALPHONSE FRANCOIS ERNEST FERRA
Application grantedgrantedCritical
Publication of FR479218ApublicationCriticalpatent/FR479218A/en
H04B3/30—Reducing interference caused by unbalanced currents in a normally balanced line
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Engineering & Computer Science
(AREA)
Computer Networks & Wireless Communication
(AREA)
Signal Processing
(AREA)
FR479218D1915-07-071915-07-07
Distribution system intended to reduce the influence of traction currents on telegraph and telephone networks
ExpiredFR479218A
(en)
Coupling device and arrangement, in particular in emergency or rescue call installations, for the transmission of indications characterizing the calling subscriber