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Title: Patent protractor in form of set square, patented by Henry M [Go to resource]
Description: Patent protractor in form of set square, patented by Henry Marle in 1885 and "approved by the Science & Art Dept. South Kensington" License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: combined scale protractors
drawing instrumentsTemporal: 1885-1895 Source: Science Museum Identifier: 1987-604 Go to resource More Like this...
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