Cts (NYSE:CTS) joins Smtc Corp (NASDAQ:SMTX), Iec Electronics (AMEX:IEC), and Key Tronic (NASDAQ:KTCC) as an electronics manufacturing service (EMS) that has crossed our stock screens.  Investing in SMTX, IEC, and KTCC has been a frustrating task for our team over the last several years.  Positive portfolio returns provided by these companies were…

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