Uwe a nwere ike izute ọkọlọtọ GB/T, ọkọlọtọ ISO, ọkọlọtọ JIS, ọkọlọtọ US.A ga-enyocha akwa niile 100% tupu ebupu ya dịka ọkọlọtọ isi ihe anọ nke America si dị.