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JOHN PATRICK O DONNELL
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JOHN PATRICK O DONNELL
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Publication of FR338805ApublicationCriticalpatent/FR338805A/en
B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
B61L23/08—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only
B61L23/12—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only partly operated by train
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Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
FR338805D1903-12-301903-12-30
Improvements to signal devices for railways
ExpiredFR338805A
(en)