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U87 differences
Author: stanley N Gimbert
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Date: 10/16/2006
I have one U87AI sn 43063 it has the little meter and a place for 2 22.5V batterys

The other U87AI sn 82171 has a pc board labled U89 30 U4
No meter and no place for batterys

Why the difference?  
 
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