To: Tim Mascorella,
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     Tim,
     The cathode end of a diode is marked by a square pad on the PCB.  There are 
     other ways of marking the cathode end of a diode on a PCB.  One way we mark 
     PCBs are by putting a line on the cathode end.  The above information was 
     found in a "Component Identification" Desk Reference Manual written by IPC.
     
     hope this helps,
     Rodney Shaver
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