Clauss, W: Ueber Weichenthürme und verwandte Sicherheits-Vorrichtungen für Eisenbahnen,
Braunschweig 1878
Disposition des kleinen Interlocking-Apparates.
Kleiner Interlocking-Apparat (Buden-Apparat).
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Locking frame in a ground level cabin
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Locking frame for ground level cabin
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Sidan uppdaterad den 13 februari 2010