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gliederkessel from nebeneinandergereihten roehrenbatterien, consisting of upper and lower wagerechten sammelrohren and this one sunken, close results, vertical, narrow tubes are formed
gliederkessel from nebeneinandergereihten roehrenbatterien, consisting of upper and lower wagerechten sammelrohren and this one sunken, close results, vertical, narrow tubes are formed