Felt hardening machine

作者: Gilbert J Sanford , Hugo P Boeddinghaus , Freyer Bela

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参考文章(9)
Schieferstein Georg Heinrich, Power-transmitting means by oscillatory movements ,(1922)
Frederick Franz, Boesch Arthur H, Robert Pash, Apparatus for and method of treating hat bodies ,(1938)
Joseph S Pecker, Felt treating machine ,(1937)
Gordon F Dodge, Vibrating apparatus control ,(1932)