Whenever it can be shown,as here,that the applicant is in the same trade as the person who has registered the trade mark,and wherever the trade mark,if remaining on the register,would,or might,limit the legal rights of the applicant,so that by reason of the existence of the entry on the register he could not lawfully do that which,but for the existence of the mark upon the register,he could lawfully do,it appears to me he has a locus standi to be heard as a person aggrieved