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Former Browns center, NFLPA president JC Tretter retires
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NFLPA president, Browns center JC Tretter calls for CBA review
Browns release JC Tretter, turning to Nick Harris at center
JC Tretter announces his retirement - NBC Sports
JC Tretter had interest in Dallas Cowboys and Minnesota Vikings
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Cleveland's J.C. Tretter Elected President of N.F.L. Union - The