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apparatus for measuring accurately, on the railways, on the one hand, the value of collapse when the permanent is not responsible and, on the other hand.the height of each cross to collapse a loaded axle, for the maintenance of the railway coies.
apparatus for measuring accurately, on the railways, on the one hand, the value of collapse when the permanent is not responsible and, on the other hand.the height of each cross to collapse a loaded axle, for the maintenance of the railway coies.