{HEAD ~ The inner wall member} includes a transverse bottomplate which is provided with a series of openings around {TAIL ~ its periphery} 
{ HEAD ~ The inner wall member } includes a transverse bottomplate which is provided with a series of openings around { TAIL ~ its periphery }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL