Unfolding mechanism for envelope opening apparatus
作者： Edward A Krupotich
DOI:
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摘要:
lens.org 参考文章(4)
Edwin F Pierce, Edward A Krupotich, Robert E Berg, Envelope opener and distribution apparatus ,(1959)
Elmer E Wolf, William H Garrett, Machine for opening and removing the contents of envelops. ,(1903)
Eugene B. Hitchcock, Can packaging method and machine ,(1961)
Morris P Neal, James L Neal, Sylvan V Dice, Packaging machine and method ,(1959)