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B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L17/00—Switching systems for classification yards
B61L17/02—Details, e.g. indicating degree of track filling
B61L17/023—Signalling; Signals with multiple indicating means
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FR487603D1916-03-201917-11-15Perfectionnements aux dispositifs indicateurs de route et signalisateurs pour chemins de fer et analogues
ExpiredFR487603A
(fr)