Method and apparatus for manufacturing pencils

作者: Lorenian Zareh

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参考文章(7)
Kochendorfer Frkderic Shields, Fibrous article and method for producing such article ,(1923)
Charles E Daniels, Method and apparatus for making pencils ,(1926)
Howard Harry Webb, Wire-coating machine. ,(1907)
Joseph L. Ray, Method of producing coated cores ,(1927)
Riley H Howard, Pencil-making machine. ,(1908)