Apparatus for closing paper bags
作者： William R Penrod , William R Peterson
DOI:
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摘要:
lens.org 参考文章(3)
Esli A Marsh, Tape applying and cutting apparatus ,(1937)
Belcher Daniel, Frank R Linda, Bag closing machine ,(1940)
Lillard O Wilfong, Material feed control apparatus for sewing machines ,(1939)