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Radioactive 5751

I have some JAN GE 5751 from 1963 that have the 3-triangle radioactive marker on the tube itself and the box, and the box also has printed on it "RE 187. 0.00001Uc".
Anyone have knowledge on these markings and/or why some type of radioactive substance would be used in a tube?
I know this is a bit of a strange one, but got curious.
Thanks for input!
V/r
jstrm


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Topic - Radioactive 5751 - JSTRM 00:52:51 02/17/09 (9)

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