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Title: Brass 18-inch rolling parallel rule with adjustable line spa [Go to resource]
Description: Brass 18-inch rolling parallel rule with adjustable line spacing device, by Elliott's patented 1866 and inscribed "Davies's Patent Proportional Parallel Rule", in mahogany case License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1866-1876 Source: Science Museum Identifier: 1987-1183 Go to resource More Like this...
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