March 30, 1953. On August 7, 1952, petitioner (union) and respondent (employer) stipulated, among other things, that one Pagan (an employee) be "reinstated" in respondent's screw driver department "on probation" and that, if respondent claimed that Pagan's production average in that department fell below a certain standard, the matter was to be submitted to arbitration, the named arbitrator being given authority to "determine how the dispute should be resolved", and the award to be binding upon both