 The ngwaahịa na-emepụta na-nditịm dị ka ụlọ ọrụ ọkọlọtọ nke JTT327 - 2004 Highway Bridge Rubber Mgbasawanye Device nke Ministry of Communications nke Ndị mmadụ Republic of China, JTT4 - 2004 Rubber Abutment Standard, JT391 - 1999 nzukọ nke mmepụta nke Basin - Type Standard . 