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Private equity firm GTCR said Friday it sold a minority equity stake in portfolio company, Resonetics to funds affiliated with Carlyle in a deal that values the Nashua, N.H., medical device micro-manufacturer at about $2.25 billion. The firms did not disclose the dollar amount of the minority investment. Carlyle will join GTCR as a "meaningful shareholder" in Resonetics, the firm said. GTCR made its initial investment in Resonetics in 2018 in partnership with medical technology industry executiv