Apparatus for feeding sheets vertically
作者： Carl W. Spohr
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lens.org 参考文章(5)
Belcher Daniel, Harold V Kindseth, Mechanism for feeding blanks ,(1938)
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Carl Beckmann, Magazine for labeling and wrapping machines. ,(1916)
Frank R. Schmitt, Apparatus for testing and classifying insulating sheets according to dielectric strength ,(1947)