Elevated platform dolly

作者: William J Schemers

DOI:

关键词: Computer science

摘要:

参考文章(6)
Elijah J Preston, Folding sick-room table ,(1923)
Ralph H Swaisgood, Portable folding scaffold ,(1942)
James M Zimmerman, Automobile repairer's support. ,(1914)
Alfred H Hanson, Combination ladder and hand truck ,(1948)
Henry O Klee, Table top construction ,(1933)