Christmas tree stand
作者： Rocco Ernesto
DOI:
关键词: Forestry 、 Christmas tree 、 Computer science
摘要:
lens.org 参考文章(3)
Henry A Doring, Rotatable support for christmas trees ,(1933)
Garrett Richard, Christmas tree base ,(1932)
Arthur L Harris, Charles L Harris, Rotary display apparatus ,(1933)