The gun carriage of the 21 cm Kanone 52 and the further developed 21 cm Kanonen 39, 39/40 and 39/41 as wel as the 24 cm Haubitze 39 resp. 39/40 were moved with the forward and rearward Fahrgestell für Lafette - chassis for gun carriage - 21 cm Kanone 52.
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