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Rejected biohazard symbols

Rejected biohazard symbols

As seen on http://web.archive.org/web/20110716160837/http://www.hms.harvard.edu/orsp/coms/BiosafetyResources/History-of-Biohazard-Symbol.htm
Copyright holder is unclear; this usage is considered fair use by virtue of being commentary on the development of trefoil symbols.

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