DIN EN ISO 6556:2013 Laboratory glassware - Filter flasks (ISO 6556:2012); German version EN ISO 6556:2012 has been changed from DIN 12475:1996 Laboratory glassware - Filter flasks, cylindrical shape.
DIN EN ISO 6556:2013 Laboratory glassware - Filter flasks (ISO 6556:2012); German version EN ISO 6556:2012 has been changed from DIN 12476:1983 Laboratory glassware; filter flasks, conical shape.