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GEM calculator, 1890.

Hills, Jennie

GEM calculator, 1890.
4 0 c m
actual image size: 26cm x 32cm


The GEM calculator is a simple device for the addition of money. Numbers are added by inserting a stylus against the figure and pulling downwards. The design for this calculator was patented by J Guthrie in 1890 (patent no 15062).

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