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Title: Lilly's spiral slide rule, patent no.28603 (1912), 13 1/2" d [Go to resource]
Description: Lilly's spiral slide rule, patent no.28603 (1912), 13 1/2" diameter License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: slide rule (spiral) Source: Science Museum Identifier: 1914-401 Go to resource More Like this...
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