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This is done by girls, who, with very fine files, rub off the edges and any protuberances which may be there. Every letter is subject to this operation, and all are turned out smooth and well finished.

Author

Scientific American Supplement, No. 841, February 13, 1892
Available from gutenberg.org

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Monday 2 November 2020

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968*1200

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• Places / Europe / Britain

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