ES214636A1 - Un procedimiento para la fabricación de piquetes destinados especialmente a fijar distancias y nivelación horizontal o vertical en líneas férreas
- Google Patents
Un procedimiento para la fabricación de piquetes destinados especialmente a fijar distancias y nivelación horizontal o vertical en líneas férreas
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ES214636A1954-04-081954-04-08Un procedimiento para la fabricación de piquetes destinados especialmente a fijar distancias y nivelación horizontal o vertical en líneas férreas
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