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Specification of James Childs
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Patent for "an improvement in applying heat in the manufacture of artificial gums and teeth, and other articles composed of india-rubber or gutta percha combined with sulphur."
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the long version
Patent for "an improvement in applying heat in the manufacture of artificial gums and teeth, and other articles composed of india-rubber or gutta percha combined with sulphur."
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"Patent for "an improvement in applying heat in the manufacture of artificial gums and teeth, and other articles composed of india-rubber or gutta percha combined with sulphur.""
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