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Title: Boxwood Harrow Mark Reducer slide rule by E.S.A., London. [Go to resource]
Description: Boxwood Harrow Mark Reducer slide rule by E.S.A., London. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: slide rule Source: Science Museum Identifier: 1974-454 Go to resource More Like this...
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