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Application filed by Jacob TschoppfiledCriticalJacob Tschopp
Publication of CH70721ApublicationCriticalpatent/CH70721A/de
CH70721A1915-03-111915-03-11Formstein zur Herstellung von armierten Hohlkörperbetondecken mit in einem rechten Winkel sich kreuzenden Tragrippen
CH70721A
(de)