public double min_width(){
  if (min_width != null)   return min_width.doubleValue();
  min_width=Double.valueOf(500);
  return min_width.doubleValue();
}

public double min_width ( ) { if ( min_width != null ) return min_width . doubleValue ( ) ; min_width = Double . valueOf ( 500 ) ; return min_width . doubleValue ( ) ; }
return the mininal width of the shapes of this drillitem on all signal layers .
