22 In my opinion, the relevant orders made by Registrar Wallace did not preclude the respondent from adducing evidence from himself, co-workers and others to the effect that they had used the grinders in question and that, based upon their personal experience, the equipment produced vibrations, of a specified nature and extent, which had a particular physical effect on them. Also, the Registrar's orders did not preclude the respondent from calling suitably qualified medical practitioners (for example, occupational physicians) to give evidence as to their opinions, and as to findings and opinions recorded in medical literature, of the effect on workers of relevant exposure to vibrations caused by the grinders in question or comparable equipment. If the respondent called evidence, of the kind I have just described, at a trial of the District Court action, it could not be concluded, on the materials before Registrar Wallace, the learned Judge or this Court, that the respondent's claim had no reasonable prospect of success. Certainly, it could not be concluded that the action was frivolous, vexatious or an abuse of process.