Description: number carculated for best efficiency; Name: type code
Description: pure number calculated at the point of best efficiency; Name: type number
Description: The norm in fixed relation to the feature being described. This defines the parameters that influence the contents of the correlated feature. Type and number of the norm with issue year and issue month must be given, e.g. DIN ISO 4711:YYYY-MM.; Name: Reference norm material, pumping medium