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SIF Societe Independante de Telegraphie Sans Fil
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SIF Societe Independante de Telegraphie Sans Fil
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Application filed by SIF Societe Independante de Telegraphie Sans FilfiledCriticalSIF Societe Independante de Telegraphie Sans Fil
Application grantedgrantedCritical
Publication of FR522577ApublicationCriticalpatent/FR522577A/fr
B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
B61L3/16—Continuous control along the route
B61L3/22—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
B61L3/221—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation using track circuits
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Physics & Mathematics
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Mechanical Engineering
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FR522577A1920-08-171920-08-17Dispositif pour la transmission sans fil à distance, de signaux mécaniques, spécialement applicable aux chemins de fer
ExpiredFR522577A
(fr)