Collapsible highway cone
作者： Gregory P. Mazzola
DOI:
关键词:
摘要:
lens.org 参考文章(4)
Milton T. Cory, Traffic control drum ,(1983)
Bruce E. Campbell, Collapsible traffic cone marker ,(1978)
Bryon G. Barnard, Collapsible marker cone ,(1979)
Jean Rimkus, Portable collapsible traffic marker ,(1968)