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Re:Biohazard: Iconic Symbol Designed to Be “Memorable but Me... by polm23 on Monday June 06, 2016 @11:17PM (#11852149)
Find this and other symbols in Hornung's Handbook of Designs and Devices, first published in 1932.

https://en.wikipedia.org/wiki/Clarence_P._Hornung

http://www.amazon.co.jp/Handbook-Designs-Devices-Pictorial-A...

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