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W.S.Pen,BSc.ALRI. (1968). Injection Moulding of Elastomers . London: #N/A.

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W.S.Pen,BSc.ALRI. Injection Moulding of Elastomers. London: #N/A, 1968. Text.

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W.S.Pen,BSc.ALRI. Injection Moulding of Elastomers. London: #N/A, 1968. Text.

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W.S.Pen,BSc.ALRI. Injection Moulding of Elastomers. London: #N/A, 1968. Print.