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JOHN PATRICK O DONNELL
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JOHN PATRICK O DONNELL
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Application filed by JOHN PATRICK O DONNELLfiledCriticalJOHN PATRICK O DONNELL
Application grantedgrantedCritical
Publication of FR331296ApublicationCriticalpatent/FR331296A/fr
B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
B61L5/12—Visible signals
B61L5/14—Form signals, e.g. semaphore arms
B61L5/16—Local operating mechanisms for form signals
B61L5/167—Local operating mechanisms for form signals using electrically controlled fluid-pressure operated driving means
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Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
FR331296D1903-03-281903-03-28Perfectionnements aux signaux pneumatiques de chemin de fer
ExpiredFR331296A
(fr)