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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 FR332531ApublicationCriticalpatent/FR332531A/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
B61L5/04—Fluid-pressure devices for operating points or scotch-blocks
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Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
FR332531D1903-05-191903-05-19Perfectionnements aux appareils de signaux pour chemins de fer
ExpiredFR332531A
(fr)