{TAIL ~ The longitudinal section} of the solid portion around the holes of the conductive porous structure is formed into an essentially egg like shape, and the acute angle side of {HEAD ~ the egg like longitudinal sectional shape} is disposed so as to direct to the waterproof membrane 
{ TAIL ~ The longitudinal section } of the solid portion around the holes of the conductive porous structure is formed into an essentially egg like shape , and the acute angle side of { HEAD ~ the egg like longitudinal sectional shape } is disposed so as to direct to the waterproof membrane
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH