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Title: Ham's proof rule, 4ft x 3", with three slides, c. 1860 [Go to resource]
Description: Ham's proof rule, 4ft x 3", with three slides, c. 1860 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: slide rule (excise)
slide rule (Ham)Temporal: 1855-1865 Source: Science Museum Identifier: 1954-322 Go to resource More Like this...
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