File:US114945 - Patents for Injection Moulding by John Wesley Hyatt (Diagram 1).png

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English: Fig 1- The images shows billard ball made from celluloid

Fig 2 - Cross section of billard balls Fig 3 - Injection moulding apparatus

Fig 4 - Front view of injection moulding apparatus
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: US114945 Improvement in processes of coating billiard-balls, knife-handles, and other articles.pdf
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Author John Wesley Hyatt

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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

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