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Title: "Trical", plastic circular slide rule with two volvelles for [Go to resource]
Description: "Trical", plastic circular slide rule with two volvelles for knitting calculations, French, with instruction sheet License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: circular slide rule (knitting) Source: Science Museum Identifier: 1990-673 Go to resource More Like this...
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