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trefoil origins

Can anyone tell me the origin/significance of the radiation warning symbol,

trefoil and colors?



thank you



Michael Krzesniak

Crane Division, Naval Surface Warfare Center (NSWC Crane) 

Harnessing the Power of Technology for the Warfighter 

Code 6054 Bldg. 3059 

300 Highway 361 

Crane, IN  47522-5001 

Ph:  812.854.6086 

Fax:  812.854.3008 

Email:  krzesniak@atd.crane.navy.mil 





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