Original Trefoil Warning Sign from Berkeley (ca. 1948)
This warning sign was produced for use at the Radiation Laboratory in Berkeley. The folks at Berkeley wanted to use a blue background but recognized that the magenta trefoil stood out more clearly on yellow.  I suspect that this was either a later version of the sign used at Berkeley or possibly part of a test run.  At least some of the Berkeley signs were produced by the Eastman Tag and Label Company at 162 Grand Avenue in Oakland California.

Donated by George Warlick 

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Last updated: 07/25/07
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