ES16495A1 - Un aparato mejorado para hacer automática y eléctricamente señal a los trenes de ferrocarril de si está o no libre la vía.
- Google Patents
Un aparato mejorado para hacer automática y eléctricamente señal a los trenes de ferrocarril de si está o no libre la vía.
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ES16495A1894-10-301894-10-30Un aparato mejorado para hacer automática y eléctricamente señal a los trenes de ferrocarril de si está o no libre la vía.
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