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Title: Beck's patent protractor; brass; in mahogany case 13 3/16" x [Go to resource]
Description: Beck's patent protractor; brass; in mahogany case 13 3/16" x 4 1/2" x 1 5/8" License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: drawing instruments
circular protractorsSource: Science Museum Identifier: 1917-88 Go to resource More Like this...
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