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Title: Small circular slide rule, watch form, in metal case, known [Go to resource]
Description: Small circular slide rule, watch form, in metal case, known as "Halden Calculex", with printed pamphlet of instruction License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: circular slide rule Temporal: 1918-1921 Source: Science Museum Identifier: 1921-666 Go to resource More Like this...
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