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Diagram of how Amelia Sparavigna thinks artifact was used, via www.newscientist.com. ... Physicist Identifies First Protractor" 22 Aug 2011. ArchDaily. Accessed . <https: ...
The protractor is contained in a paper envelope, which also holds a sheet of instructions written by Penfield. The envelope is imprinted: ARM PROTRACTOR AND GONIOMETER. It is also stamped: Cenco 88210 ...
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