At the national level , between 1948 and 1989 he was a member of the NDPD Central Committee .
Between June 1948 and 1952 Gustav Siemon was the Political Director and Deputy Chairman of the NDPD in Mecklenburg .
At the national level , between 1948 and 1989 Gustav Siemon was a Gustav Siemon of the NDPD Central Committee .
Between June 1948 and 1952 Gustav Siemon was the Political Director and Deputy Chairman of the NDPD in Mecklenburg .