e A???-A???, respectively, showing an application brush part according to a fourth embodiment of the present invention; FIGS. 14 a and 14 b are a front view and a sectional view through line B???-B???, respectively, showing an arrangement brush part according to the fourth embodiment of the present invention; FIGS. 15 a and 15 b are a front view and a sectional view through line C???-C???, respect