Title (German) Mümliswil-Ramiswil, Bau der Passwangstrasse, Südportal Zingelentunnel, Lehrgerüst für die Gewölbemauerung des Vortunnels

Mümliswil-Ramiswil, construction of the Passwangstrasse, south portal of the Zingelen tunnel, falsework for the vault walling of the pre-tunnel

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