41. Where a certificate of competency granted under this Ordinance is, during the period of its validity, lost or destroyed or so defaced or mutilated as to be useless and the person to whom it was granted, being entitled thereto, proves to the satisfaction of the authority granting or authorised to grant the same that such loss, destruction, defacement or mutilation is not due to his fault, such person shall be granted a copy of the certificate to which, according to the record kept under section 40 he appears to be entitled, and the copy so granted shall have the same effect as the original.