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Title: GEM calculator, 1890. [Go to resource]
Description: "Gem" calculating machine, J. Guthrie's patent No.15062, 1890 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: adding machine (stylus) Temporal: 1890-1900 Source: Science Museum Identifier: http://collectionsonline.nmsi.ac.uk/grab... Go to resource More Like this...
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