Book stop device

作者: Howard E Berk

DOI:

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摘要:

参考文章(6)
Gonczy Emery, Coat rack for chairs ,(1940)
Claude W Kress, Display holder device ,(1935)
Samuel Klein, Display-stand for advertising. ,(1915)
Alfred G Parke, Frame unit and bracket structure ,(1951)
George W Fay, Merchandising display rack ,(1936)