The plaintiff union sued the defendant employer to compel arbitration of the employer’s refusal to count, for purposes of the accumulation of retirement benefits, the period of three and one-half years during which the union was on strike. The district court declined to order arbitration, agreeing with the employer that the dispute concerned the pension plan, as distinguished from the collective bargaining agreement or the settlement agreement that was entered into at the conclusion of the strike.

We have reviewed the briefs on appeal and pertinent portions of the record and have heard the arguments of counsel. Because we find no reversible error, the judgment is AFFIRMED.