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JOHANN HERRMANN DITRICH BLANKE
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JOHANN HERRMANN DITRICH BLANKE
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Application filed by JOHANN HERRMANN DITRICH BLANKEfiledCriticalJOHANN HERRMANN DITRICH BLANKE
Application grantedgrantedCritical
Publication of FR478514ApublicationCriticalpatent/FR478514A/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
B61L5/20—Audible signals, e.g. detonator audible signalling
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Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
FR478514D1915-04-261915-04-26Signaux avertisseurs plus spécialement applicables aux tramways, etc.
ExpiredFR478514A
(fr)